Why do observers in different frames of reference find the laws of physics the same, according to relativity?

Observers in different frames of reference find the laws of physics to be the same due to the principle that all observers measure the same speed of light. This is a fundamental postulate of Einstein's theory of special relativity. Regardless of the motion of the observer or the source of light, all observers, no matter their relative velocity, will measure the speed of light in a vacuum to be approximately 299,792 kilometers per second. This invariance of the speed of light leads to the conclusion that the laws of physics must be the same across different inertial frames of reference. Consequently, this principle necessitates adjustments to our understanding of time and space, leading to phenomena such as time dilation and length contraction, but fundamentally ensures that the underlying laws remain consistent for all observers.

The other options do not accurately represent this core idea in relativity. For instance, light behaving inconsistently does not support the universality of physical laws; instead, it is the consistent behavior of light at a constant speed across all frames that upholds this principle. Similarly, while acceleration can differ between observers, it is the constant speed of light that crucially links their experiences of physical laws. Gravitational influences pertain more to general relativity than special relativity,