The man who calls out first is Man C.
Why? After some time, Man D has not shouted out the colour of the hat he is wearing. Hence Man C knows that he (Man C) cannot be wearing the same-coloured hat as Man B. If he is, then Man D will be able to see two white hats and will therefore know that his own hat is black.
Since Man C is not wearing the same-coloured hat as Man B and Man B is wearing a white hat, that means Man C knows that he is definitely wearing a black hat.
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