Final answer:
The word that best completes the sentence is 'estudiar'.
Step-by-step explanation:
The word that best completes the sentence is estudiar.
The sentence 'Claudia y Alejandra van a estudiar en la Universidad' translates to 'Claudia and Alejandra are going to study at the University'.
It is clear from the context that the missing word should be related to education, and 'estudiar' means 'to study' in Spanish.
Learn more about Completing sentences in Spanish