How to use JSON data in creating a chart with chartjs?

In my controller I have an Action method that will find all questions in a table called Questions, and the answers for each question. This Action is of type ContentResult that will return a result serialized in Json format.

public ContentResult GetData()
{
    var datalistQuestions = db.Questions.ToList();
    List<PsychTestViewModel> questionlist = new List<PsychTestViewModel>();
    List<PsychTestViewModel> questionanswerslist = new List<PsychTestViewModel>();
    PsychTestViewModel ptvmodel = new PsychTestViewModel();

    foreach (var question in datalistQuestions)
    {
        PsychTestViewModel ptvm = new PsychTestViewModel();
        ptvm.QuestionID = question.QuestionID;
        ptvm.Question = question.Question;
        questionlist.Add(ptvm);

        ViewBag.questionlist = questionlist;

        var agree = //query
        var somewhatAgree = //query
        var disagree = //query

        int Agree = agree.Count();
        int SomewhatAgree = somewhatAgree.Count();
        int Disagree = disagree.Count();

        ptvmodel.countAgree = Agree;
        ptvmodel.countSomewhatAgree = SomewhatAgree;
        ptvmodel.countDisagree = Disagree;

        questionanswerslist.Add(ptvmodel);
        ViewBag.questionanswerslist = questionanswerslist;
    }

    return Content(JsonConvert.SerializeObject(ptvmodel), "application/json");
}

Now, my problem is the pie chart is not being created and I don't quite know how to push the values to my data structure? What should I be doing instead?

Here is my script:

@section Scripts {
    <script type="text/javascript">
           var PieChartData = {
                    labels: [],
                    datasets: [
                        {
                        label: "Agree",
                        backgroundColor:"#f990a7",
                        borderWidth: 2,
                        data: []
                        },
                    {

                        label: "Somewhat Agree",
                        backgroundColor: "#aad2ed",
                        borderWidth: 2,
                        data: []
                    },
                    {
                        label: "Disgree",
                        backgroundColor: "#9966FF",
                        borderWidth: 2,
                        data: []
                        },

                    ]
            };

            $.getJSON("/PsychTest/GetData/", function (data) {
            for (var i = 0; i <= data.length - 1; i++) {
                PieChartData.datasets[0].data.push(data[i].countAgree);
                PieChartData.datasets[1].data.push(data[i].countSomewhatAgree);
                PieChartData.datasets[2].data.push(data[i].countDisagree);
            }

            var ctx = document.getElementById("pie-chart").getContext("2d");

            var myLineChart = new Chart(ctx,
                {
                    type: 'pie',
                    data: PieChartData,
                    options:
                    {
                        responsive: true,
                        maintainaspectratio: true,
                        legend:
                        {
                            position : 'right'
                        }
                    }
                });
        });

</script>