Seclude means to keep a somebody away from other human beings.
While, segregate means to separate. For example, in US History, African Americans were segregated from white Americans.
So seclude is used for one person, while segregate is used for groups of people or things.
When writing an outline, coordination means that C. all items in main headings and subheadings should be of equal importance.
Coordination when writing an outline implies that items in Heading 1 should have equal significance with the items in Heading 2.
This same principle applies to subheadings. The items in various subheadings should have equal and commensurate importance.
So, option C captures what coordination means in outlines.
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