In the traditional culture of China, the picture of "happiness" (as shown in the picture) consists of four patterns, both symmetrical and central.

A, it is not an axisymmetric figure, nor is it a central symmetric figure, so it is wrong;

B, an axisymmetric figure, is also a centrally symmetric figure. Therefore, it is correct;

C is an axisymmetric figure, not a centrally symmetric figure. Therefore, it is wrong;

D is not an axisymmetric figure or a centrally symmetric figure, so it is wrong.

So choose B.