Can someone please help me with this U.S. History question?

Those who criticized the war with Mexico often expressed which of the following ideas?

A. They expressed racist fears that victory would bring nonwhite Mexicans into the United States.

B. They expressed the fear that the war would widen and engulf all of Latin America.

C. They expressed the belief that the war was unconstitutional.

D. They expressed the belief that the United States military was unprepared for the conflict.

Thanks!