If I get this wrong please don't judge:
C. Different parts of the sun rotate at different rates.
The sun isn't a solid, its a big ball of gas.
Answer:

or

Explanation:
As we know that the beat frequency is given as

here we know that


now we have

now we have

so we have

or

D I think is the correct answer
If the cylinder is slightly
I think that this is false but I am not sure