7. Besides learning to speak and read English, another goal of an ESL program is to

A. prepare immigrant students for U.S. citizenship.
B. help immigrant students “graduate” from bilingual classes to English-only ones.
C. reduce the use by immigrants of their native tongue.
D. help immigrants assimilate and adjust socially to their new country.

I am having trouble finding this answer. I am thinking the answer is "D".