2. Which of the following quotes from The Call of The Wild best demonstrates a central theme?

He must master or be mastered; while to show mercy was a weakness.
He saw, once and for all, that he stood no chance against a man with a club.
Buck stood...the dominant primordial beast who had made his kill...
The ghostly winter silence had given way to the great spring murmur of awakening life.

He must master or be mastered; while to show mercy was a weakness.