Retriving JSON result on Ajax call in MVC4

Following code returns all the states comes under given country. Here country is passed through ajax call.

/*Following action receives "country" as argument from Ajax call and retrieves all the states*/

 public JsonResult GetStates(string country)
        {

            using (AMSEntities Context = new AMSEntities())
            {
                int id = Convert.ToInt32(country);
                List<AMSState> conti = Context.AMSStates.Where(x => x.CountryId == id).ToList();
                var query = (from x in conti select new { Id = x.StateId, Name = x.StateName });
                return Json(query, JsonRequestBehavior.AllowGet);
            }
        }

/*Ajax call for above action in MVC4 "#state" is the Id dropdown list who is showing the result*/

 $("#state").prop("disabled", true);
        $("#country").change(function () {
            if ($("#country").val() != "Select Country") {
                var options = {};
                options.url = '@Url.Action("GetStates", "Agreement")';
                options.type = "POST";
                options.data = JSON.stringify({ country: $("#country").val() });
                options.dataType = "json";
                options.contentType = "application/json";
                options.success = function (state) {
                    $("#state").empty();
                    for (var i = 0; i < state.length; i++) {
                        $("#state").append("<option value=" + state[i].Id + ">" + state[i].Name + "</option>");
                    }
                    $("#state").prop("disabled", false);
                };
                options.error = function () { alert("Error retrieving states!"); };
                $.ajax(options);
            }
            else {
                $("#state").empty();
                $("#state").prop("disabled", true);
            }
        });