Window grilling is a traditional art in China. Among the following four tracery patterns, the one that is not axisymmetric is () A.B.C.D

A, it is an axisymmetric figure, which does not conform to the meaning of the question;

B, it is an axisymmetric figure, which does not conform to the meaning of the question;

C, an axisymmetric figure, does not meet the meaning of the question;

D, it is not an axisymmetric figure, and no such straight line can be found to make a figure fold in half along a straight line, and the parts on both sides of the straight line can overlap each other, which is in line with the meaning of the question;

Therefore, choose: d.