The correct answer is A.
The Sheriff of Nottingham is the atchetype of villan in this story.
The Sheriff is the man responsible for puting a bounty on Robin's head and declaring him an outlaw for killing his cousing and poaching the king's deer.
He serves as an archetype of villan because he is a vicious, cruel man who often takes advantage of those under his jurisdiction. His mission is to stop Robin, the protagonist, and his Merry Man from achieving their goal. And he represents Robin's moral foil: his vice is money and power, whereas Robin only steals from the rich to give to the poor and has no interest in status and power.