¿Cuál?

Two young women in a split-screen video react to an off-screen prompt, making synchronized hand gestures and facial expressions; the woman on the left, with blonde hair and a pink shirt, and the woman on the right, with brown hair in a braid and a striped shirt, both form an 'OK' sign with their hands, then open their mouths in surprise, and finally make a 'stop' gesture with their hands, all while standing in separate indoor settings.