Which of the Following Could Be Considered a Secondary Boycott

Multiple Choice

Which of the following could be considered a secondary boycott?

A) A union encourages consumers not to purchase from Wal-Mart because Wal-Mart uses nonunion labor.
B) A union encourages consumers not to purchase from Wal-Mart because it sells products that are produced by a company that they are currently striking.
C) A union encourages its members not to purchase from Wal-Mart because Wal-Mart uses nonunion labor.
D) A union refuses to work on a job site where nonunion labor is also working.