Las mujeres ___ viejas.
Answer: a) Las mujeres son viejas.
Translation: The women are old.
Step-by-step explanation:
The verb "ser" is used in Spanish to describe permanent characteristics, and the verb estar is used to describe temporal characteristics.
Since "viejas" is an adjective that is used for the elderly and age is a permanent feature, then the verb "ser" must be used. As the subject in this sentence is "Las mujeres", who is a third-person in the plural, the verb must be conjugated in this form. Ellas son.
Spymore