The statement that is true is: "Earth's day is based on the Earth's rotation."
A year is the time in which the earth does a complete revolution across its orbit. And a day is the time in which the Earth does a complete rotation around its axis.
Remember that the orbit o the Earth is around the Sun, then we can see that the statement "Earth's day is based on the Earth's rotation." So the correct option is B.
If you want to learn more about the Earth.
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