在某药物代谢动力学研究中对10名研究对象进行了血浆浓度(X)和每克蛋白的药物吸附量(Y)的测定，结果如下

\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n

ID	1	2	3	4	5	6	7	8	9	10
x	12.7	21.2	51.7	77.2	212.4	9.5	22.5	42.3	67.8	234.8
y	0.10	0.466	0.767	1.573	2.462	0.08	0.399	0.899	1.735	2.360

欲比较两者的变异度大小，应选用下面哪项指标

A．χ²
B．S
C．SX
D．CV
E．M