Consider the Classes Below,declared in the Same File

Consider the classes below,declared in the same file:
Class A
{
Int a;
Public A()
{
A = 7;
}
}
Class B extends A
{
Int b;
Public B()
{
B = 8;
}
}
Which of the statements below is false?

A) Both variables a and b are instance variables.
B) After the constructor for class B executes,the variable a will have the value 7.
C) After the constructor for class B executes,the variable b will have the value 8.
D) A reference of type A can be treated as a reference of type B.