What lateral clearance are motorcycles required to leave when passing vehicles travelling in the opposite direction?

A)A maximum of 1.5 metres.
B)A minimum of 1.5 metres in all cases.
C)Sufficient lateral clearance so that the crossing can be carried out safely and without danger.Correct
Motorcycles shall travel on the right side of the carriageway, as close as possible to its right edge, maintaining sufficient lateral clearance to cross safely, especially on bends and crests with reduced visibility.
The 1.5 metres is the lateral clearance they must leave when overtaking any vehicle outside built-up areas.