Phytoliths Are Most Useful for Identifying

Phytoliths are most useful for identifying:

A) regional, rather than local patterns of vegetation.
B) plants that were domesticated prehistorically since their phytoliths differ significantly from those of wild plants.
C) the abundance of different kinds of grasses; not all plants produce phytoliths.
D) the abundance of all plants present at a site; all plants produce phytoliths.