Hi Lennie,
I'm not sure if ReactiveAutoComplete is the right component for your use case. An autocomplete typically is used if you also allow values that are NOT presented in the dropdown list. It's more a list of suggestions, really. Think of it like the Google search field that gives you suggestions, but you are free to search for anything you like.
If you want users to select one of the values in a predefined list, you should be using Dropdown, DropdownSearch or LazyDropdownSearch. These components only allow the user to select one of the values from the list of options, which seems to be what you want.
Kind regards,
Steven