Select the answer choice below that best explains the reasoning for your conclusion about the depositional environment. Group of answer choices

a. Underlain by marine rocks and overlain by fluvial rocks; presence of coal and freshwater plants; sand-filled channels and cut-and-fill structures.
b. Characteristics suggest deposition in a continental environment; interbedded shale and limestone; cross-beds, and ripple marks
c. Characteristics suggest deposition in a marine environment; red color; marine fossils; ripple marks and small- to large-scale cross-bedding
d. Characteristics suggest deposition in a marine environment; interbeds of banded chert; laminae and graded bedding; marine fossils