The order of the stages of primary succession beginning with glacial retreat as seen at Glacier Bay, Alaska, are ________.
A. Pioneer, Dryas, Spruce, and Alder stages
B. Pioneer, Alder, Dryas, and Spruce stages
C. Pioneer, Dryas, Alder, and Spruce stages
D. Pioneer, Spruce, Alder, and Dryas stages
E. Pioneer, Spruce, Dryas, and Alder stages