About Dike roads and mountain driving: which statement is WRONG?

Do not drive up the mountain in too high a gear; the engine is better off revving more than being lugged, because too few revs raise the engine temperature considerably and increase the risk of engine damage.
✓ When descending it is best to shift to a higher gear than during the climb, to spare the engine.
Dike roads are also winding and less clear than they look, have blind uphill side entrances, a narrow carriageway, sloping verges unsuitable for evasive manoeuvres, and overtaking is often not safely possible there.
Climbing traffic must be given priority by descending traffic, not the other way around.

Correct answer: When descending it is best to shift to a higher gear than during the climb, to spare the engine.

Explanation

Take descents in the same gear as the climbs and make use of the engine's braking effect; do not drive with dragging brakes

Do not drive up the mountain in too high a gear; the engine is better off revving more than being lugged, because too few revs raise the engine temperature considerably and increase the risk of engine damage
Dike roads are also winding and less clear than they look, have blind uphill side entrances, a narrow carriageway, sloping verges unsuitable for evasive manoeuvres, and overtaking is often not safely possible there
Climbing traffic must be given priority by descending traffic, not the other way around