A second's pendulum (which has a time period of exactly 2 seconds on Earth) is taken to the Moon, where the acceleration due to gravity is one-sixth of that on Earth. To maintain its time period of 2 seconds on the Moon, what adjustment must be made to its length?

Options:

• A: Its length must be increased to 6 times its original length.
• B: Its length must be reduced to one-sixth of its original length.
• C: Its length must be reduced to 1/sqrt(6) of its original length.
• D: Its length must be kept unchanged.

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