Final answer:
The verb form that correctly completes the conversation is 'tengo.'
Step-by-step explanation:
The correct answer is A. tengo. In this conversation, Ana is saying that she will do aerobics tomorrow, and she is inviting Pamela to come with her. Pamela apologizes and says that she has yoga classes tomorrow. Since Pamela is talking about her own schedule, she should use the verb form 'tengo,' which means 'I have' in Spanish.
Learn more about Verb forms in Spanish