Final answer:
The appropriate preterite form of the verb ser is 'fue'. The preterite tense is used to talk about completed actions in the past.
Step-by-step explanation:
In the given dialogue, the appropriate preterite form of the verb ser is fue. The preterite tense is used to talk about completed actions in the past, whereas the imperfect tense is used to describe ongoing actions or states in the past.
In this case, the sentence is referring to a specific moment in the past when Jorge was very handsome, so we use the preterite tense fue.
For example: "¿Te acuerdas de Jorge? ¡Él fue muy guapo!" translates to "Do you remember Jorge? He was very handsome!"
Learn more about Spanish verb conjugation