The correct response is: Sam is correct because their mass would be the same on the moon as it is on Earth.
Here's the breakdown:
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Bella is correct in saying that they would weigh less on the moon because the moon has less gravitational pull than Earth. However, her statement does not address the mass directly.
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Sam is also correct in saying that their mass would remain the same on the moon as it is on Earth. Mass does not change based on location.
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Jackie is incorrect because she claims that weight and mass would stay the same on the moon. While mass does remain constant, weight is dependent on gravity, so it would decrease on the moon.
Thus, the best answer is that Sam is correct regarding mass, and Bella is correct regarding weight. However, if you're asked for a single correct statement, the emphasis on mass makes Sam's response the most precise.