从四个选项中选择最合适的一个填入问号处，使之呈现一定的规律性：（　　）。

A、<img width="39" height="20" src="http://admintk.100xuexi.com/UpLoadImage/2016-08-23/2f670bc2-344f-4622-ab0c-d650e25c7a60.png" />

B、<img width="37" height="17" src="http://admintk.100xuexi.com/UpLoadImage/2016-08-23/b5a07440-5c62-4704-881f-df3d392634fc.png" />

C、<img width="35" height="21" src="http://admintk.100xuexi.com/UpLoadImage/2016-08-23/897661ee-e03f-4e6b-a31e-b2933352392c.png" />

D、<img width="36" height="18" src="http://admintk.100xuexi.com/UpLoadImage/2016-08-23/33ce8660-e78a-4dd4-9dd3-980cbd44601c.png" />