Amemorable piece of literature usually has:
a. forgettable characters.
b. lots of action with very little character development.
c. events that occur because of conflicted characters.
d. beautiful settings.

C.events that occur because of conflicted characters.

Explanation:

In literature, action can be quite forgettable. Forgettable characters will never make anything great. And beautiful settings are like action, they can be forgettable. That is because the soul of a literature piece is the story and/or the characters. And they are much more important than all the other things cited because they give soul and motive to the work and the happenings in it.

did you ever get an answer? i'm on the same question : (