Answer:
c. sparked similar successful demonstrations throughout the South.
Explanation:
The Greensboro sit-in consisted of a demonstration of civil rights that took place in the 60s, during which African American students carried out a sit-in at a segregated buffet in Woolworth, Greensboro, NC. They opposed exiting the place after the place's staff had denied to serve them. Afterward, this movement expanded to other southern towns.