I think the asker wants to know your profession and what you do for example i will answer by saying i am a student studying about blah blah blah.
D. The others answer only parts of it and d explains it as a whole
Answer:
It is 3, or C.
Explanation:
I love that book, and I remember how it said that John Thornton was Buck's last tie to civilization, And once he died Buck was free to go primitive without anything holding him back. Loving him caused Buck to be unsure of himself and his primitive identity.