The answer is: You all.
It’s not that hard.
Stevens, the head butler at Darlington Hall, is the protagonist and narrator of The Remains of the Day.<span> A mercilessly precise man, his relentless pursuit of "dignity" leads him to constantly deny his own feelings throughout the novel. For Stevens, "dignity" involves donning a mask of professional poise at all times. Although there is merit in the ideas of decorum and loyalty, Stevens takes these concepts to an extreme. He never tells anyone what he is truly feeling, and he gives his absolute trust to Lord Darlington—a man who himself makes some very poor choices in his life. Although throughout much of the story it seems that Stevens is quite content to have served Lord Darlington—believing that Darlington was doing noble things at the time—Stevens expresses deep regret at the end of the story for failing to cultivate both intimate relationships and his own personal viewpoints and experiences. </span>
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.