Vosotros preguntáis por el trabajador. (You ask about the worker.)
Step-by-step explanation:
The correct way to conjugate the verb "preguntar" in the second person plural (you) in the present indicative is "preguntais". In this case, this form is used to complete the sentence and form a question asking about the worker.
The verb "to ask" is a regular verb that belongs to the first conjugation. This means that it follows a regular pattern of conjugation in all tenses. In Spanish, verbs are conjugated in different ways depending on tense, mood, voice, and grammatical person.
In this case, it is the conjugation in the present indicative for the second person plural (vosotros). The basic form of the verb is "to preguntar", and to form the conjugation in this person, the suffix "-áis" is added to the infinitive of the verb.