一道语法题就求指点

ylp2008

一道语法题求指点

137. Coronary angiography, a sophisticated method for diagnosing coronary disease involving the introduction of a dye into the arteries of the heart, is now administered selectively, because it uses x-rays to observe cardiac function.

(A)for diagnosing coronary disease involving the introduction of a dye into the arteries of the heart, is now administered selectively, because it uses

(B)for diagnosing coronary disease involving the introduction of a dye into the arteries of heart, is now administered selectively, because of using

(C)for diagnosing coronary disease, involves the introduction of dye into the arteries of the heart and is now administered selectively, because it uses

(D)to diagnose coronary disease that involves the introduction of a dye into the arteries of the heart, is now administered selectively, because it uses

(E)to diagnose coronary disease involving the introduction of a dye into the arteries of the heart, which is now administered selectively, uses
答案为什么是C呢， involves 不是修饰disease的吗，C怎么变成主句的谓语了，求NN指点

kiwifoodtown

involving the introduction of a dye into the arteries of heart，来修饰disease的话非常不合逻辑。

ylp2008

懂了，从逻辑上理解。