请教一道阅读题，来自36套中的29套第6题

paulkinglj

<font face="Tahoma, Helvetica, Arial, sans-serif"><span style="background-color:#fbfeff;">原文The act was vetoed by President Andrew Johnson, who argued that the Thirteenth Amendment, which abolished slavery, did not provide Congress with the authority to extend citizenship and equal protection to the freed slaves. Although Congress promptly overrode Johnson's veto, supporters of the act sought to ensure its constitutional foundations with the passage of the Fourteenth Amendment.6.</span></font><font face="Tahoma, Helvetica, Arial, sans-serif"><span style="background-color:#fbfeff;"><br /></span></font><br /><font face="Tahoma, Helvetica, Arial, sans-serif"><span style="background-color:#fbfeff;"> In the context in which it appears, &quot;overrode&quot; most</span></font><br /><font face="Tahoma, Helvetica, Arial, sans-serif"><span style="background-color:#fbfeff;">nearly means</span></font><br /><font face="Tahoma, Helvetica, Arial, sans-serif"><span style="background-color:#fbfeff;">○A trampled</span></font><br /><font face="Tahoma, Helvetica, Arial, sans-serif"><span style="background-color:#fbfeff;">○B extended</span></font><br /><font face="Tahoma, Helvetica, Arial, sans-serif"><span style="background-color:#fbfeff;">○C annulled</span></font><br /><font face="Tahoma, Helvetica, Arial, sans-serif"><span style="background-color:#fbfeff;">○D neutralized</span></font><br /><font face="Tahoma, Helvetica, Arial, sans-serif"><span style="background-color:#fbfeff;">○E compromised</span></font><br /><br /><font face="Tahoma, Helvetica, Arial, sans-serif"><span style="background-color:#fbfeff;"> &nbsp; &nbsp; &nbsp; &nbsp;为什么选C不选D啊？求大神解答</span></font>

竹林中人

Ｃ的无效比Ｄ的无效不太一样吧，建议看看他们的英文解释