Definition: In this task, you are given a context and four options. Each option is a suggested ending for the context. You should read the context and pick the best ending for the context. Please answer with "A", "B", "C", and "D".
Input: [header] How to take legal action if an employer forces you to get a flu shot [title] Check if you belong to a union. [step] Your union contract may limit your employer's ability to force you to get a flu shot. This contract is called a " collective bargaining agreement. <sep> (A) " in this agreement, you agree to pay out whatever amount of money is allowed. Without a collective bargaining agreement, your employer cannot withhold from your wages the supply of flu shots. (B) " you should check whether you are in a union and read any collective bargaining agreement. If your employer tries to force a flu shot requirement on you, you can bring a lawsuit in court. (C) " a collective bargaining agreement provides a covenant to both you and your employer that the carriers are the primary carriers of the flu. If you belong to a union, you can get a flu shot without being labeled as the primary carrier of the flu. (D) " you do not be legally bound by it. However, even if you belong to a union, you may be required to be a union member.
Output:
B