Color options are available to the customer, but the options are available on the screen,...

In this scenario, the requirement is to present color options to a customer without a popup, directly on the screen. The most suitable UI control for this situation is a dropdown. A dropdown allows users to see all available options upon interaction, occupies minimal screen space when not in use, and effectively groups single-option selections in a compact form. This approach avoids the potential clutter of radio buttons or checkboxes for numerous options and is more user-friendly than an autocomplete/text field for a fixed set of choices like colors.