图示结构，A支座竖向反力R为下列何项数值？

• A.R<img src="https://timg.fentiku.com/97/2016/12/22/25TFBPpRXO.png" title='25TFBPpRXO.png' alt='25TFBPpRXO.png'/>=3P
• B.R<img src="https://timg.fentiku.com/97/2016/12/22/ZNEih4xkAR.png" title='ZNEih4xkAR.png' alt='ZNEih4xkAR.png'/>=2P
• C.R<img src="https://timg.fentiku.com/97/2016/12/22/4rDX8o3f34.png" title='4rDX8o3f34.png' alt='4rDX8o3f34.png'/>=P
• D.R<img src="https://timg.fentiku.com/97/2016/12/22/MqTIpHCElx.png" title='MqTIpHCElx.png' alt='MqTIpHCElx.png'/>=0

正确答案：D