Question

¡ ____ todos sus regalos!
a. den
b. abran
c. dá

Answer 1

In my opinion abran would be better but the rest are good words too because its saying open your gifts everyone and its makes more sense then saying den (give) or da

Answer 2

Right answer:

b. abran

¡Abran todos sus regalos!

This is an exclamatory expression. So abran is the conjugation of the verb abrir used for the second person plural (ustedes). So someone is inviting other people to open the gifts. In this way, this sentence translates into:

Open all your gifts!