Question

you are (estar, informal) tú estás nosotros estamos él está ellos son

Explanation:

The problem is about conjugating the verb "estar" in the informal second - person singular (tú) form. In Spanish, the informal "you" is "tú", and the conjugation of "estar" for "tú" is "estás". The other options are incorrect: "Nosotros estamos" is for "we", "Él está" is for "he", and "Ellos son" is incorrect as "son" is the conjugation of "ser" (not "estar") for "they".

Answer:

A. Tú estás