When a car travelling on a motorway is moving at an abnormally reduced speed due to a breakdown, which lane will it use?

When a car travelling on a motorway is moving at an abnormally reduced speed due to a breakdown, which lane will it use?
A)On the hard shoulder so as not to be an obstacle.
B)In the right-hand lane, always.
C)In the right-hand lane, and if they are seriously disrupting traffic, they must travel on the hard shoulder.Correct
Drivers of vehicles with a maximum authorised mass not exceeding 3,500 kilograms who, due to an emergency, are travelling at an abnormally reduced speed and thereby seriously disrupting traffic, must travel on the right-hand hard shoulder, if it is usable and wide enough, and, if it is not, on the minimum necessary portion of the carriageway. When they are not seriously disrupting traffic, they must travel in the right-hand lane. They must warn other road users of this situation using the vehicle's hazard warning signal. When these drivers are travelling on a motorway or dual carriageway, they must leave the road at the first exit.