An object's mass is a measure of how much matter makes it up. An object's weight is a measure of the gravitational force that acts on it. An object's mass is always _______ its weight.
A.
double
B.
equal to
C.
half of
D.
proportional to
An object's weight depends directly on its mass. The greater its mass is, the greater its weight will be. In other words, an object's mass is proportional to its weight.
