After the rock layer is eroded which additional event must occur to create an unconformity , or a gap, in the geological time record?
A. an earthquake or a motion along a fault
B. new sediments deposits build up an eroded area
C. radioactive decay along a fault
D. a volcanic eruption near the eroded area

Question

After the rock layer is eroded which additional event must occur to create an unconformity , or a gap, in the geological time record?
A. an earthquake or a motion along a fault
B. new sediments deposits build up an eroded area
C. radioactive decay along a fault 
D. a volcanic eruption near the eroded area

otherworldly · Answer

I think D but i am not sure sorry :(