单项选择题

A.隔离层→粉衣层→糖衣层→有色糖衣层
B.隔离层→糖衣层→粉衣层→有色糖衣层
C.粉衣层→隔离层→糖衣层→有色糖衣层
D.粉衣层→糖衣层→隔离层→有色糖衣层
E.糖衣层→隔离层→粉衣层→有色糖衣层