Final answer:
The elephant has the most mass out of the given options.
Step-by-step explanation:
Mass is a measure of the amount of matter in an object. It is determined by the number of atoms and molecules in the object. Mass does not vary with location and is the same on Earth, in orbit, or on the surface of the Moon.
Out of the given options, the elephant would have the most mass. Elephants are generally much larger and heavier than marbles, forks, and baseballs.
Therefore, the correct answer is B. elephant.