Nathaniel How throne wrote four novels___"The Scarlet letter" became an American literacy classic. A. of which one B. which one C. out of which D. one was which ???

The correct answer is C. out of which.

The sentence is stating that Nathaniel Howthorne wrote four novels, and "The Scarlet Letter" became an American literary classic. The phrase "out of which" is used to indicate that "The Scarlet Letter" is one of the four novels written by Nathaniel Hawthorne.