If it is the translation of the statement it says, "Why is this guy so happy?"
Answer:
la
un
las
unas
Explanation:
you have to look and masculine and feminine words and based on that answer. You also have to look at the el/la/los/las. These words mean the.
Un/Una/unos/unas mean some/a
Me would be the correct noun to finish the sentence
19. Prefiero jugar basquetbol.