The answer would be C, a field guide. A field guide helps you identify plants and animals.
The main way dramatic tension is built is the clues that Boo gives, making him interesting, but it can also be frightening.
Also, the incidents that pop up in the story also builds up dramatic tension.
You know it’s a folk tale because we all know that nobody is going to arm wrestle an octopus. It’s just something unrealistic.