Critical Reasoning

Since the mayor's publicity campaign for Greenville's bus service began six months ago, morning
automobile traffic into the midtown area of the city has decreased seven percent. During the same period, there
has been an equivalent rise in the number of persons riding buses into the midtown area. Obviously, the mayor's
publicity campaign has convinced many people to leave their cars at home and ride the bus to work.
Which of the following, if true, casts the most serious doubt on the conclusion drawn above?

A. Fares for all bus routes in Greenville have risen an average of five percent during the past six months.
B. The mayor of Greenville rides the bus to City Hall in the city's midtown area.
C. Road reconstruction has greatly reduced the number of lanes available to commuters in major streets
leading to the midtown area during the past six months.
D. The number of buses entering the midtown area of Greenville during the morning hours is exactly the same
now as it was one year ago.
E. Surveys show that longtime bus riders are no more satisfied with the Greenville bus service than they were
before the mayor's publicity campaign began.

Ans: C
but according to me answer is E because it makes clear doubt
but about C if there is road construction then this type problem can be with own vehicle also
and but if bus taking much time so public have solid reason to choose own vehicle So, according to me E is the best answer.

Please explain me why I am wrong and why answer is C ?

Thanks
Sarwan