D. Writers follow the plot mountain as a guideline but may stray from it.
Explanation:
This is the statement that best describes the way in which writers think about the plot mountain. The plot mountain is a useful device that allows us to plan a story and the way it will develop. However, while most writers employ this to some extent, it should not be considered a rule. Most writers use it as a general guidance, but may stray from it depending on the requirements of the story.
