Answer:
The correct answer is: Rebellion
Step-by-step explanation:
The strain theory is a concept that explains that the social structure of a society can affect and pressurize the people to engage in illegal activities. This theory was developed by Robert King Merton and explains that when people adapt to strain in the following five ways: Conformity, Innovation, Ritualism, Retreatism, and Rebellion.
Rebellion are the people who do not accept and follow the existing traditional means of achieving cultural goals and tries to replace them.
Therefore, according to this theory, the behavior of a radical activist can be explained by the term rebellion.