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 gentlemen are members of this club.
It is evident from the statements that only men are invited to become part of the club. Women are not allowed to take part in the club at all. Some of the men are invited to dinner but there are also some who were not able to attend. The dinner does not seem to require the presence of all the members of the club. This means that A cannot be the answer.
B is also obviously not the right answer because it was reiterated that only men were invited to become members of the club. D cannot be the answer too because it says, gentlemen. Who knows if all the officers that were invited to dinner can be considered gentlemen.