This is not incorrect, but the answer could be challenged. Biography is the history of a man as history is the history of a place, but history can also be the history of anything, including that man. Also, it could be said that a biography is generally ABOUT a man the same way geography is ABOUT a nation (or any place, in fact). C and D are clearly incorrect, however.
This answer is completely incorrect. At first glance it may seem reasonable, but thinkabout it. Not all gentlemen are members of this club. I'm sure there is a perfectly acceptable gentleman somewhere who has never even heard of the club. In fact, there are surely more gentlemen who are NOT part of this club than those who ARE. So you see, all members of this club are gentleman, but not all ...