What does vehicle category "O" refer to?

En español: ¿A qué se refiere la categoría de vehículo "O"?

What does vehicle category "O" refer to?
A Passenger transport vehicles (buses)
B Goods transport vehicles (lorries)
C Trailers, designed to carry people or goods Correct answer
D Two-wheeled vehicles (motorcycles and mopeds)

Why this is the correct answer

Category O covers trailers, designed to carry people or goods.

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