Garbage Collection in disguise

[Sandeep Chhabra]

I found this question:
Assume that MyClass is a class which defines two methods f() and g().
How many objects would be eligible for garbage collection by the time the method g() is invoked

MyClass c1=new MyClass();
MyClass c2=new MyClass();
f(c1);
c1=null;
c2=c1;
g();

A 1
B 2
C 0
D The given information is insufficient.

First I answered it D but then thought that atleast one eligible object is visible here in this code ,ie. c2 since it has been assigned null.

But the anwers is actually D.
I know its not wrong. But even A is not wrong. So how should we answer such questions?

Thanks

[Barry Gaunt]

As you noticed, it could be one object, possibly two objects, that is/are eligible for garbage collection. So D is correct; there's not enough information to decide. Note that the question is asking for a definite number of objects, not "at least" how many - so A,B,C are definitely wrong.