When does elastic rebound happen?

Ella no está aquí.

Explanation:

The adverb “aquí” (meaning “here”) indicates place or position and gives us the clue to determine the form of the verb “to be” that correctly fills the blank (es está son and eres are all forms of the verb “to be” in Spanish).

In Spanish, there are two types of verb “to be:” “Ser” and “Estar.” Since “Estar” can indicate someone's temporary location in a place, this is the verb that we must use, so we can easily discard the options “es,” “son” and “eres” because they are all conjugations of the verb “ser.”

The verb “está,” on the other hand, is the conjugation of the verb “estar” in present and in the third person. Therefore, this is the correct answer.