If a rock is brought from the surface of the moon

The correct option is B its weight will change, but not mass
Mass of a body always remains constant. Weight depends on the gravitational acceleration $\left(g\right)$, which differs. Since acceleration due to gravity on moon is $(1/6{)}^{th}$ of that on earth. So, the weight of the rock brought from the surface of the moon will change but mass remains constant.