JSFiddle - React, Tailwind, and code Playground
HTML
<p>
Available Credit Cards:
<select data-bind="options: availableCreditCards">
</select>
</p>
JavaScript
var viewModel = {
availableCreditCards: ko.observableArray(['MasterCard', 'Visa', 'Amex', 'Diners'])
}
ko.applyBindigs(viewModel);