The Reason an Astronaut in an Earth Satellite Feels Weightless

The reason an astronaut in an earth satellite feels weightless is that

A) the astronaut is beyond the range of the earth's gravity.
B) the astronaut is falling.
C) the astronaut is at a point in space where the effects of the moon's gravity and the earth's gravity cancel.
D) this is a psychological effect associated with rapid motion.
E) the astronaut's acceleration is zero.