图1-3-26所示刚架结构右支座竖向下沉△，则结构的弯矩图是（　　）。[2010年真题]图1-3-26

A、<img width="76" height="75" src="http://admintk.100xuexi.com/UpLoadImage/2016-09-30/744adbe4-a314-450b-beb8-c855c40aacbb.png" />

B、<img width="75" height="73" src="http://admintk.100xuexi.com/UpLoadImage/2016-09-30/86afad90-2e22-4a88-8714-f1429d1ceb9e.png" />

C、<img width="75" height="76" src="http://admintk.100xuexi.com/UpLoadImage/2016-09-30/0f4f4a03-4d84-48b3-a0e7-ce68c5d2ff75.png" />

D、<img width="71" height="68" src="http://admintk.100xuexi.com/UpLoadImage/2016-09-30/3710b830-e9c9-4787-b606-d752433e9e7c.png" />