At an intersection with no stop signs or signal lights, you should:

Answer: D — Look in both directions

At an intersection with no stop signs or signal lights, the safest and most legal thing to do is to look in both directions, even if you have the right of way. This helps to ensure that there are no other vehicles or pedestrians approaching the intersection that you may not have seen. Option A - stopping and waiting your turn - is incorrect because there are no stop signs or signal lights to dictate when it is your turn. Option B - slamming on your brakes - is not advisable as it could lead to a sudden stop and potentially cause an accident. Option C - proceeding with caution - is also incorrect because it is important to thoroughly check for any potential hazards before proceeding. Therefore, the best course of action is to carefully look in both directions before proceeding through the intersection.