He denied the accusation.

The correct answer is A. justified.

To justify something is to show that it is right or reasonable. In this case, the man is denying the accusation, which means he is saying that it is not true. He is trying to show that the accusation is not reasonable or justified.

The other options are not correct because they do not mean the same thing as justify.

• To speak means to talk. In this case, the man is not talking about the
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  accusation, he is denying it.
• To publicize something means to make it known to the public. In this case, the man is not making the accusation known to the public,
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  he is denying it.
• To affirm something means to say that it is true. In this case, the man is not saying that the accusation is true, he is denying it.