The correct answer is dice.
•Por qué dice él gracias?
You are going to use the word dice to fill the blank because is the correct conjugation in the sentence.
On English the sentences should be:
Why does he says thank you?
Answer:
sobrina
Explanation:
La hija de mi hermana means my sister's daughter, which is your niece, which translates to sobrina.
Pablo Ruiz Picasso was a Spanish painter,
sculptor, printmaker, ceramicist, stage
designer, poet and playwright who spent
most of his adult life in France.