A Union's "Secondary Activity" Is A

A union's "secondary activity" is a:

A) boycott or strike of an employer with whom a union has no labor dispute to persuade the employer to cease doing business with the company that is the target of the labor dispute.
B) union's picketing,in addition to a strike,of a company that is the target of the labor dispute.
C) recognized union's request for an injuction against an employer who refuses to bargain in good faith.
D) refusal to represent one of its members in a grievance against the employer because the member did not engage in a strike called by the union the previous year.