This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to train your hamster to jump through a hoop
Get a hula hoop that is hamster size.
It could be a large ring covered in ribbon or a purpose-made one from the pet store. It must be large enough that the hamster can fit through it with ease but not so large the hamster isn't aware of going through an object.

(a). Inflatable hula hoop hoops have the same diameter and look alike. String should be attached to either end of the hoop with twine or a thread..
(b). Buy or make a hula hoop. You can get a hula hoop from a pet store or a set at a jeweler..
(c). Put your hamster on the floor, next to the hoop sitting flat on the floor. Get a treat or push your hamster a little over the hoop..
(d). During the first few months, the hula hoop will be very easy for you to get used to. All you have to do is put a small bit of string between the hoop and the closed door in the cage..
The answer is:
(c).