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【单选题】
物体系统处于平衡状态,摩擦不计,AB杆自重不计,BCD杆重为P,DE杆重为G,图中对物体 BCD 的受力分析,下列说法正确的是( )A.
B处约束力分析错误，C、D处分析正确
B.
C处约束力分析错误，B、D处分析正确
C.
D处约束力分析错误，B、C处分析正确
D.
三处受力分析均正确
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