What does developing an essay involve? A.
Writing an effective conclusion that includes a strong clincher

B.
Proceeding step-by-step to unfold a line of thought with the intention of convincing the reader of something

C.
Providing details to support your thesis

D.
Writing at least three supporting paragraphs, each with a topic sentence and supporting details

D.

Explanation:

Developing an essay means what process does a writer goes through in order to make an essay. Since the type of essay wasn't specified, convincing or informing a reader isn't essential, but creating three supporting paragraphs with a topic sentence and supporting details is something all essays need in order to be, well, an essay.

B. Proceeding step-by-step to unfold a line of thought with the intention of convincing the reader of something

Explanation:

A.P.E.X

the author develops a cold, and scared tone. making the reader shudder with fear, and suddenly become cold. i'm guessing that he's writing a scary novel, or maybe about a chilly december night.