Final answer:
The correct answer is A. estuviste. In Spanish, the question is asking "Did you get sick yesterday?" The verb "estar" should be conjugated in the second person singular preterite form.
Step-by-step explanation:
The correct answer is A. estuviste.
In Spanish, the question is asking "Did you get sick yesterday?" The correct form of the verb "estar" in the second person singular preterite form is "estuviste".
For example, you can say "Estuviste enfermo/a ayer" to mean "You were sick yesterday."
Learn more about Spanish verb conjugation