Studies of test scores

[himu]

Studies of test scores show that watching television has a markedly positive effect on children whose parents speak English as a second language, as compared to those whose native language is English.


to those whose native language is English

with children whose native language is English

with those who are native English speakers

to children whose parents do not

with children whose parents are native English speakers

[The Iceman]

himu, suggest you to underline the relevant part of the sentence so that it is easy to spot.

As per the intended meaning of the sentence, the comparison should be between:

children whose parents speak English as a second language and children whose parents are native English speakers

Eliminate A,B, and C.

D also gets the comparison wrong. In this option the comparison is made with "children whose parents do not speak English as a second language". This does not necessarily mean that such parents are native English speakers; it may be the case that English is not at all spoken by such parents.

E wins

Also, the use of both "compared to" and "compared with" is correct here. So, do not eliminate any option on the basis of any distinction between the two. GMAT has done away with the distinction it had on this issue.