You should use your mirrors to check?

Answer: D — Where the rear of the vehicle is while you are making turns

Mirrors should be used to check for objects in the blind spot or for vehicles approaching from the rear. Option A is incorrect because it refers to other drivers' reactions, which are unpredictable and cannot be relied upon while driving. Option B is incorrect because checking inside the vehicle is not necessary while driving, as the focus should be on the road ahead and surroundings. Option C is incorrect because while weather conditions can affect driving, checking the mirrors for objects and vehicles is a more immediate safety concern. Option D is the correct answer, as it is important to monitor the position of the rear of the vehicle while making turns to ensure proper positioning and avoid hitting other vehicles or objects.