Eva: cuastas personas viven en tu casa?
laura:

a) si, jamas hemos vivido juntos

b) somos seis personas

c) no, no somos muchos

d) si, todoos viven conmigo

The right answer is the B) Somos seis personas.

Explanation: Just to elaborate a little on the answer, it can be added that the question that Eva has asked Laura is "How many people live in your house?" The answer, therefore, should include a number. Option A means "Yes, we have never lived together," so it can be discarded. Option C means "No, we are not many," so it can be discarded too. Finally, option D means "Yes, all (of them) live with me." The right answer is option B, since it translates as "We are six people."