Answer: The correct option is a.
Explanation: Mass is defined as the actual matter that exists in the body.
Weight is defined as the force acting on the body by the gravity. Mathematically,
W = mg
Where, m = mass
g = acceleration due to gravity
Mass remains same at any point on the universe but weight changes as the acceleration due to gravity changes.
So, when an object is transported from the Earth to the Moon, the weight of the object will change but the mass of the object will remain same.