根据图示梁的弯矩图和剪力图.判断系因下列何种外力作用而产生的？( )

• A.<img src="https://timg.fentiku.com/97/2016/12/22/6vP2KeYa43.png" title='6vP2KeYa43.png' alt='6vP2KeYa43.png'/>
• B.<img src="https://timg.fentiku.com/97/2016/12/22/FZmDLlRnQ2.png" title='FZmDLlRnQ2.png' alt='FZmDLlRnQ2.png'/>
• C.<img src="https://timg.fentiku.com/97/2016/12/22/iiR0IG7SL2.png" title='iiR0IG7SL2.png' alt='iiR0IG7SL2.png'/>
• D.<img src="https://timg.fentiku.com/97/2016/12/22/VYh0dm9pzz.png" title='VYh0dm9pzz.png' alt='VYh0dm9pzz.png'/>

正确答案：C