The best definition for poor in the passage is meager.
In this scene, the ghost of King Hamlet and the young Hamlet interact, with the ghost telling Hamlet how he was murdered by his own brother, who than took his crown and position. He than asks Hamlet to take the revenge on his uncle for murdering his father and marrying his mother. Poor is used as to mean that his request is simple, not a big deal.
b. Fortunato has never been found.
The key sentence for the answer is "For half of a century no mortal has disturbed them." Half a century is fifty years. We know that Montressor built the wall that night and walled in Fortunato. This eliminates A. Also, C is just wrong since he entombed Fortunato, not the old bones. Option D is also wrong since Fortunato is dead - he's not sleeping. The statement "no mortal has disturbed them" best indicates that Fortunato has never been found.
