The servants do not "abscond" because Montresor tells them to stay at home; they do so because he tells them he will be gone all night. They don't care if he finds out that they all left to join in the carnival. He can't fire them because he can't get anybody to replace them.
A is correct because the commons are always suppose to be after something your naming
For Quistion 1 It is A ) They are shocked and panicked. And For the second one it is C) Only the Wealthiest membersof society had servants. Hope this helps!