To prevent further terrorist acts, the u. s. felt that it was necessary to end the taliban regime in
a. afghanistan.
c. iran.
b. iraq.
d. pakistan.

The answer is a. end the Taliban regime in Afghanistan. President George W. Bush sent U.S. troops to Afghanistan to end the rule of the Taliban and to root out Al Quieda terrorist from the region.  U.S. troops are still in the country fighting them to this day.