Final answer:
An object's mass remains unchanged when taken from Earth to the Moon, but its weight decreases because the Moon's gravitational acceleration is about 1/6th of Earth's.
Step-by-step explanation:
When an object is taken from Earth to the Moon, its mass remains the same while the weight decreases due to the lower acceleration due to gravity on the Moon. The acceleration of gravity on the Moon is about 1/6th that of Earth's, which means the object's weight will be about one sixth on the Moon compared to its weight on Earth. The correct answer is that the object's mass remains the same.