What does "A map of the city, colored to designate nationalities, would show more stripes than on the skin of a zebra, and more colors than any rainbow..." mean?

Which of the following lists correctly orders the earth's layers from its innermost layer to its outermost layer? a. mantle, inner core, outer core, crust b. crust, inner core, outer core, mantle c. crust, mantle, outer core, inner core d. inner core, outer core, mantle, crust