Question

What was the biggest challenge in foreign policy facing US presidents in the 1990s? the fall of Soviet communism the rise of unilateralism the terrorist attacks on the United States the development of China's military

Answer 1

"the terrorist attacks on the United States" would be the best option from the list since communism was already on the fall and the US had just suffered a terrorist attack in New York City. 

Answer 2

Answer: the correct answer is the terrorist attacks on the United States

Explanation: there were many terrorist attacks in the 1990s and the attacks take the toll on American citizens too. Here's a list of terrorist attack in the 1990s:

February 26, 1993. World Trade Center bombing, in New York City.

Philippines, December 11, 1994. A bomb explodes on board Philippine Airlines Flight 434 which was flying from Manila to Tokyo, the plane lands safely at Naha Airport in Okinawa.

Algeria, December 24, 1994. Air France Flight 8969 hijacking in Algiers by 3 members of Armed Islamic Group of Algeria and another terrorist.

Algeria, January 30, 1995. A car bomb exploded outside of a police station.

India, July 20, 1995. A bomb on a motor scooter exploded at a marketplace in Jammu. Harkat-ul-Ansar claimed responsibility for the bombing.

Egypt, April 18, 1996- Islamist gunmen fire on the Europa hotel in Cairo.

Saudi Arabia, June 25, 1996. Khobar Towers bombing.

Tanzania. August 7, 1998. United States embassy bombings in Dar es Salaam and Nairobi, Kenia