"¿Cuando van Uds. a comprar la computadora nueva?" "_____ vamos a comprar la semana proxima."

a. la
b. los
c. las
d. lo

(i've crossed out A and D from my choices)

And why did you cross them out? How many times to I have to say: NUMBER (SINGULAR/PLURAL) AND GENDER (MASCULINE/FEMININE)

The answer is very obvious if you keep those 2 things in mind. And it IS one you crossed out!

Sra