Which is a sentence fragment?

A. Panting after the run, Judy struggled to catch her breath.

B. Unhappy about the decision, Janine relented anyway.

C. Having stormed out in the middle of an argument with Josh.

Your answer would be C). Having stormed out in the middle of an argument with Josh.

The reason why this is your answer is because the sentence isn't complete. When you read the question, you wonder what happened after storming out in the middle of the argument. It would be a completed sentence if we knew what happened after they stormed out.