An antagonist is the character who basically causes the problems in the story. They do not have to be a bad person, they just simply have to create the conflict for the protagonist, whether on purpose or accidentally.
The correct answer is C. He leads a group of men in grand and dangerous adventures.
An archetype is a character that appears in literatures all over the world - every nation has a character that might fit into this description. It is a common character that is known to everyone - a hero who takes his people on grand adventures.
Odysseus is one of such characters, but so is Beowulf, and even Harry Potter, in modern literature.
Please give us the story:)