Final answer:
The correct form of the verb tocar to complete the sentence is toqué (option A).
Step-by-step explanation:
The correct form of the verb tocar to complete the sentence 'Anoche yo ________ la guitarra' is toqué (option A).
This is the correct form for first-person singular (yo) in the past tense. For example, 'Ayer toqué la guitarra en el concierto'.
In this sentence, 'yo' means 'I' and 'tocar' means 'to play'. So the correct answer is 'Anoche yo toqué la guitarra'.
Learn more about Conjugation of the verb tocar in Spanish