The Second Postulate of Special Relativity States That ____

The second postulate of special relativity states that ____.

A) observers cannot detect their uniform motion except relative to other objects
B) observers cannot distinguish locally between inertial forces and uniform gravitational forces due to acceleration and the presence of a massive body
C) the laws of physics are the same for all observers regardless of their motion as long as their speed is constant
D) the speed of light is constant and will be the same for all observers independent of their motion relative to the light source
E) the acceleration of an object is proportional to the applied force and inversely proportional to its mass