Which document element should most likely be underlined or boldfaced?
a. checklist items
b. bullet points
c. image captions
d. subheadings

Subheadings

Explanation: Checklist doesnt make sense, neither does bullet points. Image captions would probably be close, but Subheadings is the answer.

answer; i believe that the correct answer is (north and south);

- "a nonrestrictive clause functions as a modifier to a noun (that is an object, person or concept). these clauses can be described by the following three options: it is set off by comas, it contains a subject and a verbs and it adds nonessential information to the sentence.

for example, in "here is bill gates, who confounded microsoft software company" we can identify "who confounded microsoft software company" as a nonrestrictive clause modifying the noun bill gates. this clause can be describes as a nonrestrictive clause because it is separated by a comma, it adds nonessential information to identify who bill gates is and it must contain both a subject (who) and a verb (confounded)."