When merging into traffic, it is obligatory to facilitate the maneuver for...

A)taxis, but only within built-up areas.
B)public passenger transport vehicles only.
C)all vehicles.Correct
When you see a driver trying to merge into traffic, you must facilitate the maneuver as far as possible, especially if it is a bus attempting to merge from a designated stop.
Within built-up areas, in order to facilitate the flow of collective passenger transport vehicles leaving designated stops, drivers of other vehicles must:
- move laterally when possible,
- reduce their speed, provided they can do so without risk, without abruptness, and signalling it correctly, and
- stop, if necessary, so that they can merge into traffic.