Structure is
a. the way an author chooses to format his paragraphs and line spacing
b. the method a writer might use to organize her ideas before writing
c. the textual element that is not affected by an author's purpose or audience
d. is the way ideas are organized and presented in a text

the correct answer is d.   to change the pace

explanation:

voracity is the noun corresponding to the adjective voracious, which means (1) eager to consume a great amount of food, or (2) marked by an insatiable appetite. veracity is far more common than the rare voracity, so the latter is sometimes used in place of the former.