Mort is on Earth, and Velma passes him at a high speed. Mort and Velma each carry a standard kilogram. Concerning the kilograms, Velma observes that
A) Velma's is less massive than 1 kilogram and Mort's has a mass of 1 kilogram.
B) Velma's has a mass of 1 kilogram, but Mort's is less massive than 1 kilogram.
C) both have a mass of 1 kilogram.
D) Velma's has a mass of 1 kilogram, but Mort's is more massive than 1 kilogram.
E) Velma's is more massive than 1 kilogram and Mort's has a mass of 1 kilogram.
D
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