nikhilkatira wrote:Concerns about public health led to the construction between 1876 and 1904 of three separate sewer systems to serve metropolitan Boston.

A. Concerns about public health led to the construction between 1876 and 1904 of three separate sewer systems to serve

B. Concerns about public health have led to the construction of three separate sewer systems between 1876 and 1904 to serve

C. Concerns about public health have led between 1876 and 1904 to the construction of three separate sewer systems for serving

D. There were concerns about public health leading to the construction between 1876 and 1904 of three separate sewer systems serving

E. There were concerns leading between 1876 and 1904 to the construction of three separate sewer systems for serving

Please answer with explanation

My answer is B.

Concerns about public health led to the construction between 1876 and 1904 of three separate sewer systems to serve metropolitan Boston.

A. Concerns about public health led to the construction between 1876 and 1904 of three separate sewer systems to serve
Cream of the crap...This looks the best answer but not the perfect one!!

B. Concerns about public health have led to the construction of three separate sewer systems between 1876 and 1904 to serve --> have led .... wrong tense


C. Concerns about public health have led between 1876 and 1904 to the construction of three separate sewer systems for serving --- the sentence construction is wrong... have led .... wrong tense

D. There were concerns about public health leading to the construction between 1876 and 1904 of three separate sewer systems serving -- tense all mixed up

E. There were concerns leading between 1876 and 1904 to the construction of three separate sewer systems for serving - meaning issue

nikhilkatira wrote:Concerns about public health led to the construction between 1876 and 1904 of three separate sewer systems to serve metropolitan Boston.

A. Concerns about public health led to the construction between 1876 and 1904 of three separate sewer systems to serve

B. Concerns about public health have led to the construction of three separate sewer systems between 1876 and 1904 to serve

C. Concerns about public health have led between 1876 and 1904 to the construction of three separate sewer systems for serving

D. There were concerns about public health leading to the construction between 1876 and 1904 of three separate sewer systems serving

E. There were concerns leading between 1876 and 1904 to the construction of three separate sewer systems for serving

Please answer with explanation

Need sth which will explain something abt 'systems' - to serve/serving prefered over 'for serving' => A/B/D remained
B - past event, but 'have led' => out
D - compared with A, phrase 'concens abt public health' moved near 'construction => health is leading the construction, when its the concerns thts leading the construction - OUT
IMO A

nikhilkatira wrote:Concerns about public health led to the construction between 1876 and 1904 of three separate sewer systems to serve metropolitan Boston.

A. Concerns about public health led to the construction between 1876 and 1904 of three separate sewer systems to serve

B. Concerns about public health have led to the construction of three separate sewer systems between 1876 and 1904 to serve

C. Concerns about public health have led between 1876 and 1904 to the construction of three separate sewer systems for serving

D. There were concerns about public health leading to the construction between 1876 and 1904 of three separate sewer systems serving

E. There were concerns leading between 1876 and 1904 to the construction of three separate sewer systems for serving

Please answer with explanation

a too