Question

¿Ustedes __________ la luz?

Answer 1

The correct answer is actually “prenden” because it translates to “do y’all turn on the light?”. While if you use “prendemos it translates to “do y’all turned on the light?” Which is wrong. So prenden is correct!

Answer 2

The answer is

¿Ustedes prendemos la luz? which means "Did you turn on the light?"

Hope it helps!