Final answer:
The correct answer is 'estuve'
Step-by-step explanation:
The subject of the question is Spanish, specifically conjugation of verbs. The verb in the sentence is 'yo enferma' which means 'I was sick'. To complete the sentence, we need the past tense of the verb 'estar' (to be) to match the subject 'yo' (I).
Out of the given options, the correct answer is OA.:
estuve (I was)
Learn more about Conjugation of Spanish verbs