Final answer:
The correct verb form to complete the statement is 'fueron'
Step-by-step explanation:
In the given sentence, the correct verb form to complete the statement is fueron.
The verb fueron is the preterite form of the verb ir (to go) and is used to indicate an action that happened in the past and is completed.
For example, 'Ellos fueron al cine el viernes pasado' translates to 'They went to the movies last Friday'.
Learn more about Spanish verb conjugation