.NET Fiddle

CSharp · Console

/Program.cs

using System;
using System.Collections.Generic;
using System.Linq;

public class Program
{
    public  void Main()
    {
        List<List<ABC>> myList = new List<List<ABC>>();

        List<ABC> tList = new List<ABC>();    
        tList.Add(new ABC(){QuestionName = "EFirstName", Response = "BBB"});
        tList.Add(new ABC(){QuestionName = "BLastName", Response = "BBBLastName"});
        myList.Add(tList);

        List<ABC> bList = new List<ABC>();    
        tList.Add(new ABC(){QuestionName = "zFirstName", Response = "BBB"});
        tList.Add(new ABC(){QuestionName = "QLastName", Response = "BBBLastName"});
        myList.Add(bList);

        Console.WriteLine("Normal List");

        foreach(var item in myList){
            foreach(var innerItem in item){
                  Console.WriteLine(innerItem.QuestionName + " | "+innerItem.Response);
            }
        }

        Console.WriteLine("++++++++++++++++++++++++");
        // Sort
        var sortedList = myList.Select(x=>x.OrderBy(y=> y.QuestionName)).ToList();


        Console.WriteLine("Sorted List");
        foreach(var item in sortedList){
            foreach(var innerItem in item){
                 Console.WriteLine(innerItem.QuestionName + " | "+innerItem.Response);
            }
        }

    }
}

public class ABC{
		public string QuestionName{get; set;}
	public string Response{get; set;}
}