单选题Which statements， when inserted at the indicated position in the following code， will cause a runtime exception when attempting to run the program？（） class A {} class B extends A {} class C extends A {} public class Q3ae4 { public static void main（String args[]） { A x = new A（）； B y = new B（）； C z = new C（）； // insert statement here } }Ax = y；Bz = x；Cy = （B） x；Dz = （C） y；Ey = （A） y；
单选题
Which statements， when inserted at the indicated position in the following code， will cause a runtime exception when attempting to run the program？（） class A {} class B extends A {} class C extends A {} public class Q3ae4 { public static void main（String args[]） { A x = new A（）； B y = new B（）； C z = new C（）； // insert statement here } }
A
x = y；
B
z = x；
C
y = （B） x；
D
z = （C） y；
E
y = （A） y；
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