Question

la novia (estaba / estuvo ) feliz el día de su boda.

Explanation:

To determine the correct verb, we analyze the context: "el día de su boda" (her wedding day) is a specific, completed event. In Spanish, "estuvo" is the preterite form of "estar", used for temporary states in completed actions or specific moments. "Estaba" is imperfect, for ongoing or habitual past actions. Since the wedding day is a specific, finished event, "estuvo" is appropriate.

Answer:

estuvo