Final answer:
The correct word to complete the sentence is 'primo.'
Step-by-step explanation:
The correct word to complete the sentence would be primo.
In Spanish, primo means 'cousin.' So the sentence would translate to 'Tatiana has a cousin named Valentín.'
This word is the best fit because it indicates a male cousin, and since Tatiana is a female name, it is most likely that she has a male cousin.
Learn more about Spanish vocabulary