To say that something is to the left of something else, we would use a la

A la izquierda.

Explanation:

In this exercise, you have to complete the sentence with a Spanish word that means what the English sentence says. In this case, the answer is "to the left" (it translates to ''a la izquierda'').

Derecha/izquierda translates to right/left in English. This is useful vocabulary in Spanish.