El auxiliar de vuelo nos recomienda que _ durante el vuelo.
a) durmamos
b) dormamos
c) duermamos
d) durmemos

The right option that fills the blank is:

- El auxiliar de vuelo nos recomienda que durmamos durante el vuelo.

Explanation:

The translation of the sentence is:

- The flight attendant recommends that we sleep during the flight.

The conjugation of the verb "dormir" used in the sentence is the Subjunctive, which is a form used to mention wishes or recommendations regularly, the conjugation of the verb "dormir" in Subjunctive Form taking into account the personal pronouns is:

How the tacit personal pronoun used in the sentence is "nosotros," the right conjugation is "durmamos."