Studies on criminal rehabilitation, particularly on patterns that occur in the parole system , show that criminals convicted of certain violent crimes stand a worse chance of being paroled early than do criminals convicted of non-violent crimes.

A a worse chance of being paroled early than do criminals

C less likely to be paroled early than those criminals.

答案是A，请问C为什么不对？

我认为C比较的前半部分是个系表结构，只有主语是名词成份，因此不加助动词的话也不会产生歧义啊？

难道还有其它错误么？

请大家指教，谢谢！

 (are) less likely to be paroled early than those criminals.

We can not use "have" (do) less likely instead of "are"(be). That's why C is wrong.

同意楼上