OPTIONS:
(A). Make sure that you wait until after your pet has had its first few hours of sleep to begin and fix the problem. If your hamster has not adjusted to the new environment, make sure that you provide a bed.;
(B). Provide your hamster with a cat or dog friendly subfloor floor bed. Making sure your hamster can rest in its subfloor can be another way to ensure it is comfortable and free from stress.;
(C). Make sure to give your new hamster at least a week to adjust to its new surroundings. This amount of time helps your pet settle into its new surroundings, since it generally runs around the tunnel multiple times before changes to normal running behavior affects it.;
(D). If your pet is stretching its limbs, that is a good sign that it's feeling relaxed. Anytime after the first week when your hamster appears settled is a great time to begin training.;Choose from options above and answer: What most naturally follows?

How to train a hamster to run through tunnels
Allow a new hamster time to adjust to its environment.
Let a new hamster settle into its home and get comfortable. Forcing your pet to perform a new activity, such as running through a tunnel, when it's still getting used to your house may cause your pet stress.
Answer:
(D).