Why are animals so prevalent in Momaday's writing?

Momaday has a soft place in his heart for cute animals

The Kiowa depended on trading animal skins for their livelihood

Momaday remembers growing up on a big farm/ranch and loving animals

The Kiowa depended on animals for their livelihood and prosperity

I just finished the test and the answer is D. The Kiowa depended on animals for their livelihood and prosperity.

Animals are so prevalent in Momaday's writing because the Kiowa depended on animals for their livelihood and prosperity.

The Kiowa, being a semi-sedentary tribe, migrated with the American bison, their main food source along with turkey, deer, antelope and plants like wild berries and wild fruit.

Furthermore, they used dogs to drag travois that had camping goods, and when they acquired horses from Spanish rancherias, they became a fully mounted warrior nation.