A Geologist Is Working in an Area of Old Volcanic

A geologist is working in an area of old volcanic rocks exposed by erosion. He finds a large rock outcrop that contains flatlying gravels in the base of the outcrop. These gravels are overlain by basalt that forms a series of layers representing flows. The uppermost basalt lava flows have a dip of about 10 degrees to the west. What does this outcrop record?

A) Gravels were initially deposited in a river valley and a cinder cone was erupted, damming the valley, before a cinder cone formed.
B) Basalt flows formed above a series of gravels, filling a river valley.
C) Basalt flows formed after gravels were deposited, covered the local terrain, and built a shield volcano with dips of about 10 degrees.
D) You can't tell anything about the history of this region from this outcrop.