Its hacemos because Mis padres y yo is talking about we. If a word ends with -mos it is talk about we.
D. el lector DVD está ala derecha de la cama.
Mina means mine. This word seems the best fit, as the others don't make sense for this context, as far as my knowledge of Spanish goes. I've studied Spanish for two years, and a few of the words I have never heard of before.
B. Bebe, come
It can be the A because they are imperative, but they are very formal.
