Answer:
B. the Authorization for Use of Military Force
Step-by-step explanation:
The U.S. Congress give the president the authority "to use all necessary force against those nations, organizations, or persons he determines planned, authorized, committed, or aided the terrorist attacks" on 9/11 in the the Authorization for Use of Military Force
Authorization for Use of Military Force is a legislature which was passed by the Senate and House of Representatives and was also approved to become a law by the president effective from September 18, 2001.
The law gives the full permission to use the United States Armed forces against all those who were involved in the September 11 attack in the United States. This law is also said to be granting permission for the use against the militant group and al-Qaeda terrorist group.