Final answer:
Option B: Marches were the strategy involving organized public demonstrations and protests in the civil rights movement, while the Greensboro Sit-In was a significant example of the sit-in strategy.
Step-by-step explanation:
In the civil rights movement, the strategy that involved organized public demonstrations and protests was marches. Marches were a common form of direct action used by civil rights activists to draw attention to issues and push for change. They were often organized and led by prominent civil rights leaders such as Martin Luther King Jr., and they played a crucial role in raising awareness and putting pressure on authorities to enact civil rights reforms.
A significant example of the strategy of sit-ins during the civil rights movement was the Greensboro Sit-In. In 1960, four African American college students sat down at a segregated Woolworth's lunch counter in Greensboro, North Carolina, and refused to leave until they were served. This act of peaceful protest sparked a wave of sit-ins throughout the South, leading to the desegregation of many public facilities.