Final answer:
The correct form of the verb 'relajar' for the subject 'Yo' is 'relajo'
Step-by-step explanation:
The correct answer is A. relajar. The sentence 'Yo me relajo en los fines de semana' means 'I relax on weekends' in English. Here, 'relajo' is the correct form of the verb 'relajar' for the subject 'Yo' (which means 'I').
Learn more about Spanish verb conjugation