某桩下独立基础在轴心荷载作用下，其下地基变形曲线示意正确的是()。

• A.<img src="https://timg.fentiku.com/img/2018-04-09/5acafd3a522ec.png" alt="" />
• B.<img src="https://timg.fentiku.com/img/2018-04-09/5acafd3a722ac.png" alt="" />
• C.<img src="https://timg.fentiku.com/img/2018-04-09/5acafd3a9320c.png" alt="" />
• D.<img src="https://timg.fentiku.com/img/2018-04-09/5acafd3ab4553.png" alt="" />

正确答案：C