图示刚架，位移△最小的是()。

• A.<img src="https://timg.fentiku.com/img/2018-04-09/5acadc3138dc6.png" alt="" />
• B.<img src="https://timg.fentiku.com/img/2018-04-09/5acadc3154f04.png" alt="" />
• C.<img src="https://timg.fentiku.com/img/2018-04-09/5acadc31771ec.png" alt="" />
• D.<img src="https://timg.fentiku.com/img/2018-04-09/5acadc31942cb.png" alt="" />

正确答案：B