图示直杆重量不计,两端分别以铰链与一可在光滑的垂直、水平滑槽内滑动的滑块A、B连接,若在直杆的中点C作用一力P>0。下列四图中,可使直杆处于平衡状态的是( )。

A、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1539673685998baddedd1495246aa88093e747d071b1e.png" alt="上传图片">

B、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1539673714230376510172b28433b8f27a5cb4f37355f.png" alt="上传图片">

C、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1539673742119083fe0e1d01845f7beeb9a95213fdcb7.png" alt="上传图片">

D、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1539673754465309bc79bb0664e79be40454b311a6f88.png" alt="上传图片">