Final answer:
The correct form to fill in the blank is 'era'.
Step-by-step explanation:
The correct answer is 'Era'.
'Era' is the appropriate preterite form of the verb 'ser' to fill in the blank. This is because the sentence is talking about Jorge's characteristics in the past, describing him as very handsome (guapo).
Other options such as 'eras', 'fue', and 'estaba' are not grammatically correct in this context.
Learn more about Verb conjugation in Spanish