What was the purpose of the national labors relations board

The National Labor Relations Board is an independent federal agency vested with the power to safeguard employees' rights to organize and to determine whether to have unions as their bargaining representative.

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well it definitly does because if you are seen as weak you will be seen as unimportant and they will walk all over you and the us is the most powerful military and the largest in the world

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the answer is d because for c the actors can't love acting for the other's audience their not even in the same show, it can't be b either because the question is talking about the actors not the audience, and it can't be a because   it's not specific enough