单项选择题

A.一级溶剂合层、二级溶剂合层、无序区、本体溶剂区
B.无充区、二级溶剂合层、一级溶剂合层、本体溶剂区
C.本体溶剂区、无序区、二级溶剂合层、一级溶剂合层
D.无序区、一级溶剂合层、二级溶剂合层、本体溶剂区