Question

translate: it is one oclock.
son las una.
es las una.
son la una.
es la una.

Explanation:

In Spanish, when telling time for "It is one o'clock", the correct phrase is "Es la una". "Es" is the third - person singular form of the verb "ser" (to be), and "la una" refers to one o'clock.

Answer:

Es la una.