Use the rock key in the question above to look at this image, what was happening in this areas past?

options:

a: the water level was shallow beach, then it rose to deep sea, then the water receded to a beach

b: water was deep and then kept getting shallower and shallower until there was no water in the area

c: the water level was shallow beach, then it rose to shallow sea, then the water receded to a beach

d: the area was covered by a shallow sea the whole time