On a straight stretch, at night, without adverse weather conditions, is the lighting that this vehicle has on correct?

The use of front fog lights, if the vehicle has them, is permitted, both day and night, on urban or interurban roads, when driving in adverse weather or environmental conditions that significantly reduce visibility. Since this is not the case in the question, it will not be correct to drive with the front fog lights on. Front fog lights can also be used on narrow roads with many curves, that is, those that, having a roadway 6.5 m wide or less, are signposted with «dangerous curves» signs. Answer c) is not correct since it only mentions a narrow roadway without referring to curves.