The action for this problem takes place in an island of Knights and Knaves, where Knights always make true statements and Knaves always make false statements and everybody is either a Knight or a Knave. Two friends A and B lives in a house. The census taker (an outsider) knocks on the door and it is opened by A. The census taker says ''I need information about you and your friend. Which, if either of you, is a Knight and which, if either of you, is a Knave?" "We are both Knaves" says A angrily and slams the door. What, if any thing can the census taker conclude?
a.A is a Knight and B is a Knave.
b.A is a Knave and B is a Knight.
c.Both are Knaves.
d.Both are Knights.
e.No conclusion can be drawn.
Not able to grasp it please someone help me