//..

    static void Main()
    {

        //..

        // Select a random proxy configuration
        var random = new Random();
        int randomIndex = random.Next(proxies.Count);
        string randomProxy = proxies[randomIndex];

        // Create a new ChromeOptions instance
        ChromeOptions options = new ChromeOptions();

        // Assign proxy to chrome instance using AddArgument
        options.AddArgument($"--proxy-server={randomProxy}");
        options.AddArgument("headless");

    }