In Newton's theory, the mass of an object which is not gaining or losing matter
(A) would be different on the Moon than on the Earth.
(B) is zero in empty space.
(C) is always the same.
(D) depends on the velocity of the object.
In Newton's theory, the mass of an object which is not gaining or losing matter
(A) would be different on the Moon than on the Earth.
No. Its weight would differ but not its mass.
In Newton's theory, the mass of an object which is not gaining or losing matter
(B) is zero in empty space.
No. It might be weightless but not massless.
In Newton's theory, the mass of an object which is not gaining or losing matter
(C) is always the same.
Yes. Mass is an intrinsic property.
In Newton's theory, the mass of an object which is not gaining or losing matter
(D) depends on the velocity of the object.
No. Not in Newton's theory
(and not in correct treatments of relativity either).