Which is the correct order of primary succession? A. lichens and mosses, pine and spruce, small herbs and shrubs, fir and birch B. lichens and mosses, fir and birch, small herbs and shrubs, pine and spruce C. lichens and mosses, small herbs and shrubs, pine and spruce, fir and birch D. lichens and mosses, small herbs and shrubs, fir and birch, pine and spruce