Three ‘neutral’ colors that are not found on the color wheel are

What are the letters of the line in the typical cliff in order from bottom to top of the staff

Prairie houses a. irregular in plan, two stories high, with one-story wings b. irregular in plan, one story high, with two-story wings c. irregular in plan, two stories high , with two- story wings d. irregular in plan, one story high, with one-story wings

Which does the author mean by " nature had to kindle all the fires, for man by his own effort was unable to produce a spark