Question

A mountain chain extends nearly 800 miles (1,290 km) from North to South Vietnam. How do you think this terrain aided the Vietnamese guerrillas who were fighting U.S. troops?

A: This terrain aided the Vietanamese guerrillas who were fighting U.S. troops by enabling them to blend into the evironment that U.S. troops were not familiar with.

Answer 1

REVISION:

This terrain aided the Vietnamese guerrillas who were fighting U.S. troops by enabling them to blend into the environment of the mountains that U.S. troops were not familiar with.

Answer 2

This is an adequate response.