The US began fighting in Afghanistan in 2001 to combat terrorist groups.
to support pro-democracy rebels.
to stop nuclear development.
to end border violence.

A. to combat terrorist groups.

Explanation:

I took the test.

s the president shall be commander in chief of the army and navy of the united states, and of the militia of the several states, when called into the actual service of the united states; he may require the opinion, in writing, of the principal officer in each of the executive departments. sooo yeahhh

explanation: