On a narrow, flat passage with no priority signs and not enough room for two vehicles at the same time, who goes first?

A)Always the vehicle with the highest maximum authorised mass (G.V.W.).
B)Always the vehicle with the greatest difficulty manoeuvring.
C)The vehicle that entered first.Correct
On a very narrow stretch of road where no priority signage exists, the vehicle that entered first has right of way.
If there is any doubt about who entered first, priority goes to the vehicle with the greatest difficulty manoeuvring. The order of priority among different types of vehicles when one of them must reverse is as follows:
1. Special vehicles and transport exceeding the established weights or dimensions.
2. Vehicle combinations, except those in point 4.
3. Animal-drawn vehicles.
4. Passenger cars towing trailers of up to 750 kilograms GVW and motorhomes.
5. Vehicles used for collective passenger transport (buses).
6. Lorries, articulated lorries and vans.
7. Passenger cars and passenger car derivatives.
8. Special vehicles not exceeding the established weights or dimensions, quadricycles and light quadricycles.
9. Three-wheeled vehicles, motorcycles with sidecars and three-wheeled mopeds.
10. Motorcycles, two-wheeled mopeds and bicycles.
When the vehicles are of the same type or of a type not listed above, priority is decided in favour of the one that has to reverse the greater distance.