What Is the Definition of Terrorism

What is the definition of terrorism?

A) the use of calculated, unlawful physical force or threats of violence against a government, organization, or individual to gain some political, religious, economic, or social objective
B) acts of violence against civilians that are carried out by enemies of a government who want to bring about political change
C) an act conducted by a government against its own citizens for the purpose of protecting an existing political order
D) a government that provides financial resources, weapons, and training for terrorists who conduct their activities in other nations