This term began to be used during the Iraq war and described the forces opposed to American involvement. Members are typically organized into covert groups who engage in organized campaigns of extreme violence.

a. terrorists
b. revolutionaries
c. insurgents
d. guerillas

c. insurgents

Explanation:

An insurgence is a violent rebellion and terms begin to be said with the opposition of the Iraq and the rise of the opposing forces and are linked to the three to four years of conflict.  In insurgence, the members are organized into groups and engage in the organized campaign of extreme violence.

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