Answer: A. Used haber to describe an action that has happened.
In Spanish, past participles are words or phrases that either end with -ido or -ado. Past participles describe something that already happened. The way this is done is by taking the ending words of a phrase, which can be -ar, -er, or -ir, and replace these with either -ido or -ado, then this is now a past participle. So I think that the correct answer is A.
Step-by-step explanation:
Hope this helps =)