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Many forested regions of today were once barren rock areas. Mot likely this change involved the following sequence of stages:

[A].	Lichens-mosses-annual herbs-wood shrubs	[B].	Annual herb-weedy shrubs-lichens-mosses
[C].	Woody shrubs-mosses-lichens-annual herbs	[D].	Mosses-annual herbs-woody shrubs-lichens

Answer: Option A