Question

Patricia y yo _______ traemos. (los vasos)

lo
las
nos
los

Answer 1

Patricia y yo nos traemos.

Answer 2

Patricia y yo LOS traemos. Los refers to los vasos. "Lo" is singular, but there is more than one vaso. "Las" is feminine, but the word "vaso" is masculine. "Nos" would mean that you two are bringing yourselves.