Select the answer that best completes this sentence: una persona alta no es . a. alta. b. baja. c. simpática. d. grande.

Here we need to choose an adjective that is the opposite to alta that means tall. Recall that an adjective is a word that gives us more information about a noun or pronoun. So the opposite adjective to tall is small and this translates into bajo/baja in Spanish. Finally, we can write and translate this sentence as follows:

Una persona alta no es baja (A tall person is not small)