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Declarations and Access Control - Programming

Q1:

public class Outer 
{ 
    public void someOuterMethod() 
    {
        //Line 5 
    } 
    public class Inner { } 
    
    public static void main(String[] argv) 
    {
        Outer ot = new Outer(); 
        //Line 10
    } 
}
Which of the following code fragments inserted, will allow to compile?

A new Inner(); //At line 5

B new Inner(); //At line 10

C new ot.Inner(); //At line 10

D new Outer.Inner(); //At line 10

ANS:A - new Inner(); //At line 5

Option A compiles without problem. Option B gives error - non-static variable cannot be referenced from a static context. Option C package ot does not exist. Option D gives error - non-static variable cannot be referenced from a static context.