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【单选题】
如图所示平面杆系结构，设三杆均为细长压杆，长度均为ι，截面形状和尺寸相同，但三杆约束情况不完全相同，则杆系丧失承载能力的情况下述中哪一种？（）A.
当AC杆的压力达到其临界压力时，杆系丧失承载力
B.
当三杆所承受的压力都达到各自的临界压力时，杆系才丧失承载力
C.
当AB杆和AD杆的压力达到其临界压力时，杆系则丧失承载力
D.
三杆中，有一根杆的应力达到强度极限，杆系则丧失承载能力
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