The answer is Rarefactions.
These are the parts of a wave that are further apart and the ones that are close together are called compressions.
I don’t think it is any of the choices stated above!
Answer:

Explanation:
We know that Rotational Kinetic Energy is given by,

Where I is the inertia and w the angular velocity. We know as well that
The we can replace,


That equation are perfect for the 4 wheel, however we need a similar expresion for the ycycle

The total energy can be expressed as follow,


Whit this expression is easy to find te ratio of rotational kinetic energy, we need to make the relation between 
(You only need to put the previous values and simplify)
Substituting 
We have

