Question:Which of the following is not an unboxing conversion? 

A void Sample1(object o) { int i = (int)o; } 

B void Sample1(ValueType vt) { int i = (int)vt; } 

C enum E { Hello, World} void Sample1(System.Enum et) { E e = (E) et; } 

D interface I { int Value { get; set; } } void Sample1(I vt) { int i = vt.Value; } 

E class C { public int Value { get; set; } } void Sample1(C vt) { int i = vt.Value; } 

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