To eliminate the possibility of using an answer more than once on a matching question, one should preferabbly cross out the answer which has already been used. But that isn’t a hard and fast rule. If you feel comfortable with using any other method that makes you understand better, you can always go for
<em>Explanation: The answer is D because, when you are turning the pedestrians are going to be walking towards the other side so, this means you have to stay alert for the citizens.</em>