When you drive on a road (not only a motorway) with at least 3 lanes (or more) in the same direction you may overtake a car that is overtaking another car. Triple overtaking is allowed when at least 3 lanes go in the same direction.
Triple overtaking is forbidden on roads with two directions traffic.
exactly, the question says it has 4 lanes in the same direction, 4 lanes are more than 3 lanes, so triple overtaking is allowed. So the answer is incorrect in this one.