大家帮忙看看这道题

Several studies have found that the coronary patient who exercise most actively 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

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

我觉得b好些呀，可是答案是e,不太明白