The sensory details in this excerpt help readers understand that Buck is as aggressive as a wolf when it comes to protecting those he loves. The correct answer is A.
It is a colder climate than Buck has ever experienced. At the first step upon the cold surface, Buck's feet sank into a white mushy something very like mud. He sprang back with a snort. More of this white stuff was falling through the air. He shook himself, but more of it fell upon him. He sniffed it curiously, then licked some up on his tongue. It bit like fire, and the next instant was gone. This puzzled him. He tried it again, with the same result. The onlookers laughed uproariously.
