imo:E

(A) that would investigate changes in working conditions as to their effects on workers’ performance

1)"that"- relative pronoun changes the meaning that experiments themselves will investigate.
2)"their" pronoun doesnt have a definate subject

(B) investigating the effects that changes in working conditions would have on workers’ performance

participle changes the meaning that "experiments" themselves are investigating.


(C) for investigating what are the effects in workers’ performance that changes in working conditions would cause

"that"-alters the meaning that workers performance will change to working condition.


(D) that investigated changes in working conditions’ effects on workers’ performance

that- alters the meaning that experiments themselves investigate.

(E) to investigate what the effects changes in working conditions would have on workers’ performance

correct- uses the right idiom "to investigate" and also preserves the meaning.


thanks.
hope this helps.

(A) that would investigate changes in working conditions as to their effects on workers’ performance

that would - changes the meaning


(B) investigating the effects that changes in working conditions would have on workers’ performance - correct

clear. precise.
Investigating - present participle refers to subject of the preceding clause.

(C) for investigating what are the effects in workers’ performance that changes in working conditions would cause

investigation - what are - redundancy

(D) that investigated changes in working conditions’ effects on workers’ performance

that - wrong usage - changes the meaning


(E) to investigate what the effects changes in working conditions would have on workers’ performance[/quote]

investigation - what are - redundancy

working conditions would have on workers - wordy+awkward construction


IMO B.

OA?

@ parallel-chase

u r right...

i felt there is a change in meaning in B...

neways.. check out the explanation by lunar power.

https://www.beatthegmat.com/hawthorne-wo ... 18601.html

OA : B

(B)