Answer:
a) Therefore the period of oscillation in the moon will increase.
b) The frequency in the moon will decrease

Step-by-step explanation:
The period of the pendulum is given by this equation:
(1)
As we can see, T is proportional to L and inversely proportional to the gravity vector. We know that g in the earth is grader than g in the moon.
(2)
Therefore the period of oscillation in the moon will increase.
(3)
Now, the frequency of oscillation is:

In this case, ω is proportional to g, then using (1) we can conclude that:

Therefore the frequency in the moon will decrease.
I hope it helps you!