Heart disease continues to decline or decrease but still tops the list of the 15 leading killers, a group that causes 89% of all American deaths.
Although heart disease continues to decline, it still causes more American deaths than any other disease.
B. About 80% of all American deaths are caused by heart disease.
C. As heart disease continues to decline, it is no longer the first of the 15 leading killers.
D. About 89% of all American deaths are caused by the disease other than heart disease in the list of 15 leading killers.