Answer:
Without animals, our food sources would be extremely limited. Animals help us in lots of different ways. We use them therapeutically as companions but they can also help tackle crime and even perform rescue operations. The combination of clever human hunters and their ferocious canine companions would have been a force to contend with. And the successful pairing has persisted ever since, leading to a vast diversity of dog breeds that help us fulfil very different goals.
Explanation:
An appositive is a noun or a noun phrase that renames another noun besides= it; it can be a long or short set amount of words.
Jack London's book is a noun phrase, and the name of it White Fang is renaming it in the sentence.
The correct answer would be "D".
Socialization prepares people for social life by teaching them a groups shared norms, values, beliefs, and behaviors. It allows society to understand each other.