Add the correct punctuation mark from the given options.

Oh poor boy _____ Why are you crying?

The correct answer is: Exclamation mark (!)

Exclamation marks are used at the end of statements when a strong emotion is being expressed (good and bad surprise, excitement or delight, but also anger, fear, or shock), and tell a reader to add emphasis to a sentence. They might also suggest that a speaker is shouting. 'Oh poor boy!  why are you crying', here exclamation mark is used to express strong emotion.