Take small breaks in between
The answer C correctly uses possessive form and is the right answer. It's not A because there is only one George so the apostrophe is in the wrong place. In B, there's not even an apostrophe and it's not clear as to whether there is only one cousin or two or more cousins. In answer D, here should not be an apostrophe for develops.
He pride's himself as a wine taster and Montessor uses this against him. Additionally when they head into the catacombs Fortunato refuses to back out even he is dizzy and is drunk.
I would have to go with ( A) on that one