下图所示的四对弯矩图和剪力图中，可能同时出现的一对是()。

• A.<img src="https://timg.fentiku.com/img/2018-04-09/5acad66ccf249.png" alt="" />
• B.<img src="https://timg.fentiku.com/img/2018-04-09/5acad66cf0591.png" alt="" />
• C.<img src="https://timg.fentiku.com/img/2018-04-09/5acad66d1bb41.png" alt="" />
• D.<img src="https://timg.fentiku.com/img/2018-04-09/5acad66d3da41.png" alt="" />

正确答案：A