An action or the movement of the planet on its tilted axis that involves a whole turn or circular motion from its initial point and back to it is called a rotation.
The time it takes for a planet to make a complete rotation is the length of its day.
Rotation of the planet is the circular turn or the motion of the planets on its axis from one point and back to it.
The rate of the rotation of the different planets varies based on their sizes and distances from the sun. It is also called the length of the day as the rotation defines the circular motion it completes in a defined day.
Therefore, option A is correct.
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