gistfile1.cs

using UnityEditor;
using UnityEngine;

public class Question1_practical
{
    [MenuItem("GameObject/Create Child Empty &#n", true)]
    static bool Validate()
    {
        return Selection.activeTransform;
    }

    [MenuItem("GameObject/Create Child Empty &#n", false)]
    static void Create()
    {
        GameObject child = new GameObject("child");
        child.transform.parent = Selection.activeTransform;
    }
}