How to get response to a radio form

I have added the code below to popup a form with three options and I’m capturing the result of my selection in modal.result.

The form displays correctly:

But based on my code I expect modal.result to be A, B or C based on my selection. Instead I get this when I display modal.result:

What am I doing wrong?

if (data.msg.addbrand && data.msg.addbrand != '') {

	var msg = 'The brand ' + brand + ' is unknown.  What would you like to do?';
	const resources = [
		{ name: "  Accept item and add brand", id: "A" },
		{ name: "  Accept item but do not add brand", id: "B" },
		{ name: "  Cancel", id: "C" },
	];
	
	const form = [
		{
		  name: msg,
		  id: "resource",
		  options: resources,
		  type: "radio",
		},
	];

	const data = {
		resource: "A",
	};

	(async function() {
		const modal = await DayPilot.Modal.form(form, data);
		alert(modal.result);
		if (modal.result == 'A') {
			var addbrand = "yes";
			acceptitemconfirmed1(addbrand);
		} else if (modal.result == 'B') {
			var addbrand = "no";
			acceptitemconfirmed1(addbrand);
		} else {	
			$(location).attr("href", "item_edit_review.php?id="+item_id);
		}
	})();
	
} else {
	addbrand = "no";
	acceptitemconfirmed1(addbrand);
}