Pick the most appropriate punctuation mark for the following sentence.
"What a good man he is ____"

The sentence 'What a good man he is ___' describes a person as good, and is a sentence that includes praise; it should therefore be followed by an exclamation mark (!). The correct sentence will be 'What a good man he is!'

Option A mentions a full stop (.), but an exclamation mark would be a better choice since the given sentence discusses praise. Option B mentions question mark (?), but the given sentence is not a question either. Option D mentions colon, but the sentence provided is not followed by another clause that has examples, lists, or illustrations; therefore, colon is not appropriate to use in the sentence provided.

The correct answer is option C, exclamation mark (!).