Most of the fossils found in virginia are in the coastal plain, valley, ridge, and appalachian plateau regions, best suggesting that these geographic provinces
a) were once covered by seawater.
b) are the oldest parts of virginia.
c) have a great deal of karst topography.
d) have large amounts of sedimentary rock.

The BEST suggesting that these geographic provinces have large amounts of sedimentary rock.

D) have large amounts of sedimentary rock.

Explanation:

Examples can be found in a few geologic regions in Virginia, including the Coastal Plain, the Mesozoic Basins, the Valley and Ridge, and the Appalachian Plateaus. Virginia likewise consolidates exceptional and bizarre fossils in Piedmont and Saltville.

Resorts directly got from this district are limestone, dolostone, sandstone, gypsum, iron oxides, earth, oil, characteristic fume and rock. These Appalachian and Cumberland Plateaus limit the Valley and Ridge with a great part of the western edge of the state.

i think that d. wind is the answer.   i missed the question when i answered a. currents.

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.