I would say that the statement which is correct about the differences between short stories and novels is A. an effective short story is carefully crafted to achieve its purpose with fewer words than is a novel.
Novels are usually quite long, and you don't have to limit yourself to any number of words, whereas with short stories, you have to think about how many words you will use, and use them effectively.
The answer is, understanding how little you know :)
That Buck,learns the club of fang,like he witness Carly died by falling or slipping,then the husky go for the kill,and by the club he learned that the man with a club is the master of Buck when he striked Buck repeatly to make him the humans master him.