Which of the Following Is Correct

Multiple Choice

Which of the following is correct:

A) A vote is not required to authorize a strike unless the union's constitution requires a vote.
B) In a vote to authorize a strike only union members in the bargaining unit are allowed to vote.
C) Secondary picketing is never allowed.
D) At least one study has established that the grievance rate is higher for employees who are not allowed to strike.
E) The strike rate has been stable over time.