Find the fourth dimension in space-time according to Einstein's theory of relativity ?

length

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height

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depth

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mass

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time

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Solution

The correct option is C time
The theory of relativity postulates the constancy of speed of light in all frames, and also introduces the fourth dimension to the three dimensional world, time. Hence the four dimensions are $(x, y, z, t)$ .
The theory, using the postulates, is able to result into length contraction and time dilation.

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