Einstein believed that the principle of relativity should apply to Maxwell's theory of electromagnetism. Which basic principle or law did this lead Einstein to propose? A) the relativity of time B) length contraction C) E=mc² D) the law of inertia E) the constancy of lightspeed

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Einstein proposed the constancy of the speed of light as a fundamental postulate of his theory of special relativity, ensuring that Maxwell's equations hold true in all inertial frames.

Einstein Believed That the Principle of Relativity Should Apply to Maxwell's