Which code block will run successfully in an execute anonymous window?

A developer has the controller class below.

Which code block will run successfully in an execute anonymous window?
A . – myFooController m = new myFooController();System.assert(m.prop !=null);
B . – myFooController m = new myFooController();System.assert(m.prop ==0);
C . – myFooController m = new myFooController();System.assert(m.prop ==null);
D . – myFooController m = new myFooController();System.assert(m.prop ==1);

Answer: C