Question

ar preterit
yo é nosotros/as amos
tú aste vosotros/as asteis
él/ella/usted ó ellos/ellas/ustedes aron
ellas ______ (jugar) ayer.
jugamos
jugó
jugaron

Explanation:

1. Identify the subject: "Ellas" is a 3rd person plural pronoun (they, feminine).
2. Match to the preterit chart: The 3rd person plural (ellos/ellas/ustedes) ending for -AR verbs is "-aron".
3. Conjugate the verb: Remove the "-ar" from "jugar" and add "-aron" to get "jugaron".

Answer:

jugaron