If recent scientific evidence is to be believed,
vaccinating children who are younger than those vaccinated in elementary school programs will create a healthy community in pre-school, which should accordingly decrease disease in the community at large.
a. vaccinating children who are younger than those vaccinated in elementary school programs will create a healthy community in a pre-school, which
b. it will create a healthier community for pre-schools to vaccinate children who are younger than those vaccinated in elementary school programs; they
c. healthier pre-school community will be created from vaccinating younger children than elementary school programs, which
d. healthier community in any pre-school will be created from vaccinating younger children than those in elementary school programs; that
e. pre-school program vaccinating younger children than those in elementary school programs will create a healthy community; they
Can someone take a look at this question?
Per Princeton Review, the answer is A. My answer is D, because I thought "which" has to modify the noun that's adjacent to "which". In this sentence, "which" doesn't modify "pre-school"
I think the answer should be D. "That" is a ambiguous, but I thought it's a better choice than A.