下列索书号排列顺序正确的是（）。

A.R47/CM2-2、R473.72/CH2/1、R423.5/CY3-3、R47/CP1
B.R473.72/CH2/1、R47/CM2-2、R423.5/CY3-3、R47/CP1
C.R47/CP1、R47/CM2-2、R473.72/CH2/1、R423.5/CY3-3
D.R423.5/CY3-3、R47/CP1、R47/CM2-2、R473.72/CH2/1