using System;

using System.Collections.Generic;

using System.Linq;

​

public record TransportationOption(decimal? Price, string Carrier, DateTime? PickupDate);

​

class TOSortingTest

{

    public static void Main()

    {

        var transportationOptions = new List<TransportationOption>(){

            new TransportationOption(Price: null, Carrier: null, PickupDate: null),

            new TransportationOption(Price: 20.00m, Carrier: "AMZX", PickupDate: null),

            new TransportationOption(Price: 10.00m, Carrier: "UPSD", PickupDate: DateTime.UtcNow.AddDays(2)),

            new TransportationOption(Price: 10.00m, Carrier: "AMZX", PickupDate: DateTime.UtcNow.AddDays(1)),

        };

        var cheapestOption = transportationOptions

            .OrderBy(to => to.Price ?? decimal.MaxValue)

            .ThenBy(to => to.PickupDate ?? DateTime.MaxValue)

            .ThenBy(to => to.Carrier)

            .First();

        Console.WriteLine(cheapestOption);

    }

}

​