It is to be noted that suppose you and your sister travel at different speeds in space and you note a slowing of her clock, compared with her clock your sister will notice that your clock runs "slower" (Option B). The theory that explains this is called the Theory of Relativity.
The theory of relativity, developed by Albert Einstein beginning in 1905, describes the behavior of objects in space and time and may be used to predict things like the presence of black holes, light bending due to gravity, and the behavior of planets in their orbits.
It's essentially a gravity hypothesis. Gravity, rather than being an invisible force that draws objects to one another, is a bending or warping of space. The greater the bulk of an item, the more warped the space around it.
The special theory of relativity is important because it helps us comprehend time and space better. The special theory of relativity defines how two observers perceive each other's motion when gravity is not a factor.
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