Final answer:
The verb form that should be used in the sentence is 'está'
Step-by-step explanation:
The correct answer is D. está. The sentence is saying 'Acapulco is in Mexico.' In Spanish, the verb 'to be' is translated as 'estar' when referring to location. So, the correct form of the verb to use in this sentence is 'está' which means 'is'.
Learn more about Spanish verb forms