It is C= It imposed fines or imprisonment on those who helped runaway slaves.
I believe the Washington Redskins will end up changing their name because in todays day & age people are very very sensitive about race, and 'redskins' is in a sense innapropriate, the same as calling an Asian person Yellow & so on so forth. I believe to further be acceptable the Washington Redskins will change their name in the near future with enough complaints.
Answer: The birth of the Prophet Muhammad in Mecca
Explanation: