How is the story of Emily Bronte's Wuthering Heights told?

How is the story of Emily Bronte's Wuthering Heights told?

A.It is told by Nelly, Catherine's old nurse, to Mr. Lockwood, a temporary tenant. The latter gives an account of what he sees at Wuthering Heights.
B. And part of the story is told through Isabella's letters to Nelly.
C. While the central interest is maintained, the sequence of its development is disordered by flashbacks making the story all the more enticing and genuine.