C. Using a specific model to prove the earth moving around the Sun.
Answer:
Lunch-ins
Explanation:
They used lunch-ins becouse it was a was to protest with out violence, often they would go up to a lunch counter and asked to be served, and if they were not, then they would leave, or stay until the police came and they would go with out force
B. stop the extension of slavery and eventually do away with it
