As a result of the Great Recession,
A. "there was a sharp decline in Mexican immigration to the United States.
B. there was a surge in Mexican immigration to the United States.
C. there were no changes to immigration patterns to the United States.
D. the United States closed its border to immigrants.

A. There was a sharp decline in Mexican immigration to the United States.

Explanation:

So basically, because of the economy dropping in the US, there were less jobs for the Mexican immigrants which usually do construction work resulting in less Mexican men immigrating to the US.

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c or d. good luck !