Final answer:
The correct form of the verb 'estar' is 'estuvo' (option B) to fill in the blank in the question.
Step-by-step explanation:
The correct form of the verb 'estar' to fill in the blank in the question '¿Dónde _______ Beatriz ayer?' is 'estuvo' (option B).
'Estuvo' is the preterite tense of the verb 'estar', which is used to indicate a past action or state. In this question, it is asking where Beatriz was yesterday, so we use the preterite tense to convey a past event.
Example: ¿Dónde estuvo Beatriz ayer? - Beatriz estuvo en el parque ayer.
Learn more about Verb forms in Spanish