Read the excerpt from The Call of the Wild. And often, such was the communion in which they lived, the strength of Buck’s gaze would draw John Thornton’s head around, and he would return the gaze, without speech, his heart shining out of his eyes as Buck’s heart shone out.

Based on this passage, what change does Buck experience as a result of his new life with John Thornton?

He feels strongly connected to his owner for the first time.
He feels physically healthy and powerful for the first time.
He understands what his owner wants of him for the first time.
He understands his own thoughts and feelings for the first time.