Final answer:
The frequency of a pendulum increases when it is moved from Earth's surface to the moon.
Step-by-step explanation:
The correct answer is option C.
When a pendulum is moved from Earth's surface to the moon, its frequency
increases
. This is because the acceleration due to gravity (g) on the moon is
less than
the acceleration due to gravity on Earth. As the acceleration due to gravity decreases, the time period of the pendulum decreases, leading to an increase in frequency. Therefore, when a pendulum is moved from Earth's surface to the moon, its frequency increases.