B Gregor would probably be seen as more of a monster and the reader would learn more about mrs.samsas feelings
C it is the most right one others mean the pebble itself was swimming! XD
Destiny
I believe that the choice we have is between "inform", "persuade", "entertain", etc: and I would say that here the purpose is to persuade. It's not an objective sentence only giving information, rather it tries to persuade people to choose this product over another one.
D. To reveal the resolution of the conflict.