Look at the outline.

What type of organization will this essay use?

Types of Friends

I. Acquaintances
A. People you hardly know but say “Hi” to anyway
II. Family friends
A. Your family
B. Friends of your family
III. Good friends
A. People you see on a regular basis, at least once a week
IV. Best friends
A. People you talk to or see everyday

A. Chronological order
B. Simple list
C. Order of importance

the answer is C.