In Call of the Wild, how does London's choice to use Alaska as a setting shape Buck's character?

A. Illustrating just how determined Buck was in searching for gold.

B. Forcing him to live or die survival situations for the first time.

C. Encouraging him to partner with Dolly and start a new pack

D. Pushing him to go against his dog nature and imitate other animals.

I believe the answer is A

B. Forcing him to live or die survival situations for the first time.

Explanation:

In Jack London's "Call of the Wild", the main protagonist Buck had to undergo drastic changes in his life such as becoming a sledge dog, a far life from his domestic life. Added to that, he had to be in the coldest regions of the world, regularly pitted against not only other wild animals but at most times, against the surrounding nature, the cold and the freezing snow. He was taken away from the domesticated, easy life to be in the most intense settings the Alaskan regions. And this forced him to either fight for his life or die giving up, thus leading to his character development in the process. But all these characterization of Buck among the Alaskan snow and mountains / wild shapes and bring the persevering and never-giving-up attitude of Buck. Through his setting, he was able to overcome obstacles, no matter how tough they may be, and become the leader of the wild pack of wolves in the end.