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Answer

Correct Option is A ‘day’ is the period of time that any planet to take one single rotation on its axis.

The correct choice for the answer is option (c): A ‘day’ is the period of time any planet to take one single rotation on its axis.
The answer lies in the last line of the first paragraph which says “It was already known that Venus has the longest day - the time the planet takes for a single rotation on its axis - of any planet in our solar system, though there were discrepancies among previous estimates.” This makes it the correct answer.

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