Answer:
B. Refusing to leave a seat on the bus
Explanation:
A boycott is defined as an act of voluntary and intentional abstention from using, buying, or dealing with a person, organization, or country as an expression of protest, usually for moral, social, political, or environmental reasons. You would boycott a bus or a certain store, but you would not be able to boycott "refusing to leave a seat on the bus," that's just stubbornness, or something.
