Final answer:
Einstein's first postulate of special relativity states that your description of physical reality is the same regardless of how you move.
Step-by-step explanation:
The correct and complete statement of Einstein's first postulate of special relativity is C) Your description of physical reality is the same regardless of how you move.
This postulate states that the laws of physics are the same in all inertial frames of reference. In other words, the physical laws and phenomena remain unchanged regardless of the observer's constant velocity or direction of motion.