Answer:

Explanation:
Given
On Earth

On the moon

Required
The astronaut's mass on the moon
The mass of an object do not change base on location
So, if the mass of the astronaut is 80kg on earth, it will be 80 kg on the moon.
Hence:

Id say (B)
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True!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
A. Gamma Rays is the answer.