The question has 4 possible responses for selection, and invites us to select more than 1 response. (The word ‘were’ not ‘was’ is used.) However, having selected one response, any attempt to select a second response un-selects the initial response that was selected. Perhaps this “logic” was not intended, as with many other Engagements (questions), it is permitted to select multiple responses, even if one or more of those responses is incorrect.
