What Is Among the Successes of Canada's Experimental Lakes Area

What is among the successes of Canada's Experimental Lakes Area? 

A)  The experiments have helped shed light on the nitrogen problem. 
B)  The experiments have demonstrated how greenhouse gases would be released from flooded peat bogs. 
C)  The experiments have been used to study black bear migrations. 
D)  The experiments have been used to study waterfowl migrations.