Answer: b
Explanation: I might have been too harsh when I got angry at the children, it past tense but still an action.
Answer:
a, b, and c could all make sense in the sentence.
Explanation:
If you are supposed to only give one answer, I would go with a since getting angry with children and most definitely be viewed as harsh. Saying I may be been to harsh doesn't make sense, you need the word 'have'.