[求助]T9-Q29. 987-637求助

T-9-Q29.
        987-637

Several studies have found that the coronary patients who exercise most actively have half or less than half the chance of dying of a heart attack as those who are sedentary.

A.      have half or less than half the chance of dying of a heart attack as those who are sedentary

B.       have half the chance, or less, of dying of a heart attack than those who are sedentary do

C.      have half the chance that they will die of a heart attack, or less, than those who are sedentary do

D.      are at least fifty percent less likely to die of a heart attack as those who are sedentary

E.       are at least fifty percent less likely than those who are sedentary to die of a heart attack

答案e,b为什么不对？nn帮忙分析下下吧

感觉C挺好

C哪里不对？

C的形容词比较不清

前面的Half the chance理论是和than组合的对象，但明显不行

而or less是插入语，不能和than组合