Final answer:
The subject of this question is Spanish. The correct answer is D. almorcé.
Step-by-step explanation:
The subject of this question is Spanish. The question is asking the student to choose the correct form of the verb 'almorzar' (to have lunch) based on the given context.
In the question, 'Ayer yo' is the subject pronoun 'yo' which means 'I'. 'yo' is followed by the verb 'almorcé' which is the correct past tense form when used with 'ayer' (yesterday). Therefore, the correct answer is D. almorcé.
Example: Ayer yo almorcé con mis amigos en la cafetería. (Yesterday I had lunch with my friends in the cafeteria.)
Learn more about Spanish verb conjugation