Answer:
Él
Explanation:
Tomás is a male name and it refers to a single person (so the answer can't be nosotros ((us)) or usted ((you but formal)) so it would be él (him), not élle (her). The way you can also tell that this is singular is because of the conjugation of va (is going to), if it were plural, the word would either be vamos (nosotros) or van (éllos/éllas).
Also, this sentence translates to Thomas (Tomás) will eat cookies!
