【单选题】
矩形截面柱如图所示,在角点C处承受一偏心压力P,设材料为铸铁,<img src="https://nimg.ppkao.com/2019-04/xiaotian/201904151708408519.jpg?sign=c62c3d7ec7f9a5e4dab5a8d5d1d554bf&t=62d7b3e1" />,则其危险点在()<br /> <img src="https://nimg.ppkao.com/2019-04/xiaotian/2019041517084713826.jpg?sign=5f096e1e5fbe2a1358dae141682eb235&t=62d7b3e1" />
A、点A
B、点B
C、点C
D、点D