What Is the Correct Sequence of Events That Has Led

What is the correct sequence of events that has led to the decimation of the kelp beds along the west coast of the U.S.?
A. Sea otters decline in numbers
B. Increase in orca predation on sea otters
C. Decline in the seals and sea otters
D. Over fishing of the herring and perch
E. Increase in the sea urchin population

A) d - c - b - a - e
B) d - c - b - e - a
C) a - d - c - b - e
D) d - b - c - a - e
E) b - d - c - a - e