Read this excerpt from The Call of the Wild by Jack London. He was called Sol-leks, which means the Angry One. Like Dave, he asked nothing, gave nothing, expected nothing; and when he marched slowly and deliberately into their midst, even Spitz left him alone. He had one peculiarity which Buck was unlucky enough to discover. He did not like to be approached on his blind side. Of this offence Buck was unwittingly guilty, and the first knowledge he had of his indiscretion was when Sol-leks whirled upon him and slashed his shoulder to the bone for three inches up and down.

Why does the author most likely include this detail?

It is a part of the exposition that introduces Sol-leks’s characteristics.
It is a part of the exposition that shows Buck’s dislike of Sol-leks.
It is a part of the rising action that describes the sled dogs’ daily routine.
It is a part of the rising action that illustrates Buck’s brute strength.