Which sentence in this introduction summarizes the thesis of the essay?

A. Schools should extend the traditional day at the school gym.
In some towns and cities in America, some of the youth of today are getting into trouble after the traditional school day ends.
C.
If this is done, many more of today's young adults would have entertaining and productive activities to participate in after school instead of getting into trouble.

C. If this is done, many more of today's young adults would have entertaining and productive activities to participate in after school instead of getting into trouble.