Complex Numbers Have the Form

Complex numbers have the form
RealPart + imaginaryPart * i
Where i is the square root of -1.Which of the following statements is false

A) C#'s simple numeric types are value types.
B) To mimic the simple numeric types, we can define ComplexNumber as a value type by using a struct (short for "structure") rather than a class.
C) C#'s simple types like int and double are actually aliases for struct types.
D) Microsoft recommends using structs for most new types, but recommends a class if the type represents a single value.