图示刚架在荷载作用下，哪种弯矩图是不可能出现的？( )

• A.<img src="https://timg.fentiku.com/97/2016/12/22/HoLcdLlF0b.png" title='HoLcdLlF0b.png' alt='HoLcdLlF0b.png'/>
• B.<img src="https://timg.fentiku.com/97/2016/12/22/TXG6WMugCA.png" title='TXG6WMugCA.png' alt='TXG6WMugCA.png'/>
• C.<img src="https://timg.fentiku.com/97/2016/12/22/MBFXRZ7mLd.png" title='MBFXRZ7mLd.png' alt='MBFXRZ7mLd.png'/>
• D.<img src="https://timg.fentiku.com/97/2016/12/22/DuDbQypKLO.png" title='DuDbQypKLO.png' alt='DuDbQypKLO.png'/>

正确答案：B