Einstein's Principle of Equivalence States

Multiple Choice

Einstein's principle of equivalence states:

A) the gravitational constant is the same everywhere in the universe
B) it is impossible to tell the difference between gravitational force and the normal force
C) every mass exerts a gravitational force on every other mass
D) gravitational mass and inertial mass are the same
E) the laws of physics are the same in all inertial reference frames