The answer is: C. The same mass.
This is because mass a quantity that stays constant no matter where we are in the universe. The mass of an object is never affected by other factors such as gravity.
So, option A. Greater mass, is incorrect.
Weight, however, is the quantity that is affected by gravity and would vary based on your position, i.e. if you are on earth or the moon in this case.
The weight of an object on the moon is 1/6th of that of its weight on earth, since the mass of the moon is a lot less than that of earth. So, the weight of an object of mass 50 kg would be 500 N (taking g = 10 m/s) and on the moon would be 83.3 N (500`-:` 6). So, the weight would always be less on the moon.
So, options B and D cannot be true as well.
The answer is in fact C, because the mass of any object is a constant (scalar) quantity.
I hope I was able to explain the answer to your question thoroughly.
Thanks for asking!