Explanation:

When someone asks a question and you didn't hear or understand it, you can use different phrases to ask them to repeat it. One of the most common phrases is "Can you repeat the question?" However, there are other expressions that can be used in this situation, such as "Pardon me?", "Excuse me?", "I'm sorry?", "What was that?", "Say that again?" or "Could you please repeat that?"

In this case, the correct answer is option 'C', which is "Huh!". This is a common interjection used to indicate that you didn't hear or understand what someone said and you need them to repeat it. The other options are also possible responses, but they are less common or may not be appropriate in all situations:

- Hey!: This is a greeting or attention-getting word that is not suitable for asking someone to repeat a question.
- Hmm!: This is a sound of contemplation or agreement that doesn't convey the message of needing clarification.
- Uh!: This is an interjection used to express hesitation or uncertainty, but it doesn't necessarily imply that you didn't hear the question.

Therefore, if you want to ask someone to repeat a question, it's best to use a polite and clear phrase like "Can you repeat the question?" or one of the other options mentioned above.