accessing data variable without even being passed to method

public Task<Bitmap> RenderAsync(ImageData data, CancellationToken cancellationToken)
{


    return Task.Run(() =>
    {

        var bmp = new Bitmap(data.Width, data.Height);
        for (int i = 0; i < data.Width; i++)
        {
            cancellationToken.ThrowIfCancellationRequested();
            for (int j = 0; j < data.Height; j++)
            {


            }
        }
        return bmp;

    },cancellationToken);