图示结构C点处的弯矩M为下列何值？( )

• A.M<img src="https://timg.fentiku.com/97/2016/12/22/XQLxiBvbOr.png" title='XQLxiBvbOr.png' alt='XQLxiBvbOr.png'/>=0
• B.M<img src="https://timg.fentiku.com/97/2016/12/22/oSiGQPXtIe.png" title='oSiGQPXtIe.png' alt='oSiGQPXtIe.png'/>=Pa
• C.M<img src="https://timg.fentiku.com/97/2016/12/22/NOpP936rKJ.png" title='NOpP936rKJ.png' alt='NOpP936rKJ.png'/>=2Pa
• D.M<img src="https://timg.fentiku.com/97/2016/12/22/oRVjQWjweG.png" title='oRVjQWjweG.png' alt='oRVjQWjweG.png'/>=3Pa

正确答案：D