On this road, as a general rule, is it permitted to remain in the left-hand lane?

On this road, as a general rule, is it permitted to remain in the left-hand lane?
A)Yes, because the road is not congested.
B)Yes, if it does not impede the progress of other vehicles.
C)No, you must move to the right-hand lane.Correct
On roads outside built-up areas with more than one lane reserved for your direction of travel, you shall normally travel in the lane furthest to the right, although you may use the other lanes in that direction when traffic or road conditions advise it, on the condition that you do not impede the progress of another vehicle following you.
With three or more lanes, lorries, vans and special vehicles with a maximum authorised mass exceeding 3,500 kg, and vehicle combinations more than 7 metres in length, shall travel in the right-hand lane and may exceptionally use the immediately adjacent one, but never the remaining ones.