A humble request – Please give KUDOS if you like the explanation.
The answer is A.
Scientists examining the body fat of pregnant rats who ate junk food have found that the propensity for making poor post-weaning food choices develops in utero, not through learned behavior.
Let us first dissect the sentence
Scientists examining the body fat of pregnant rats
who ate junk food - this is a modifier modifying the noun rats.
have found - SV pair Scientist have found
that the propensity for making poor post-weaning food choices develops in utero, not through learned behavior.
- Here that connects two clauses.
The idiom is the propensity for making…develops in utero
(A) the body fat of pregnant rats who ate junk food have found that the propensity for making poor post-weaning food choices develops
(B) the body fat of pregnant rats who ate junk food and found the propensity to make poor post-weaning food choices to develop
Examining … and found …. This is a run-on sentence that is missing a verb. Also, this is not a parallel structure
(C) the body fat of pregnant rats eating junk food and found that the propensity for making poor post-weaning food choices develops
Examining … and found …. This is a run-on sentence that is missing a verb. Also, this is not a parallel structure
(D) pregnant rats' body fat while eating junk food have found the propensity to make poor post-weaning food choices to develop
This changes the meaning of the sentence. Scientist have found the propensity to make…
(E) pregnant rats' body fat while eating junk food have found the propensity for making poor post-weaning food choices develops
This changes the meaning of the sentence. Scientist have found the propensity to make…