When you clear an aircraft for the option, after the request touch and goes, know that you are also clearing them for a stop-and-go, a full-stop landing, a low approach, or a missed approach. Low approaches are my favorite thing to do lately.
It’s not perfect, but to receive a option clearance you’d have to request a touch and go.
Knowing all of that, you have to be on the lookout for aircraft doing stop-and-goes. It’s okay to issue an exit, because you can’t full tell what the aircraft’s intentions are, but be aware that after that exit instruction, they may start rolling again.