A Secondary Boycott, in General, Is

A secondary boycott, in general, is:

A) a strike or other action by a union against the employer of the employees whose collective bargaining agreement is in question
B) a strike or other action by an employer in retaliation for the primary boycott
C) an attempt to force others to stop doing business with an employer not directly involved in the labor dispute
D) a strike or action against indirect buyers
E) none of the other choices