* Stumped by this one

[mehtamaulikd]

By installing special electric pumps, farmers’ houses could be heated by the warmth from cows’ milk, according to one agricultural engineer.
(A) farmers’ houses could be heated by the warmth from cows’ milk, according to one agricultural engineer
(B) the warmth from cows’ milk could be used by farmers to heat their houses, according to one agricultural engineer
(C) one agricultural engineer reports that farmers could use the warmth from cows’ milk to heat their houses
(D) farmers, according to one agricultural engineer, could use the warmth from cows’ milk to heat their houses
(E) one agricultural engineer reports that farmers’ houses could be heated by the warmth from cows’ milk
Can anyone please explain the correct answer.

[vishalsahdev03]

The answer is D,

A B have modifier problems. After "..pumps, " we need a subject.

E is passive
C is wordy.

Hence, answer is D.
Feel free for more clarifications.

[mehtamaulikd]

Thanks got it......!!!!!!

[vishalsahdev03]

You are welcome, anytime !

[akhil.kathuria]

Don't you think their in the option D is little ambiguous. their can refer to anyone right?
Farmers or the reporter.
Can someone please clarify my doubt :(

[Ben Ku]

Please cite the source (author) of this problem. We cannot reply unless a source is cited (and, if no source is cited, we will have to delete the post!). Thanks.