Originally Posted by
A and C
You are looking at the situation from the glider pilot point of view, gliders very rarely go anywhere apart from flying around on comps, your take off performance is dictated by the tug or winch ( except on those tubo things with lawn mower engines) so for what you do carrying the flight manual is not very useful.
Self-launching gliders have quite complex and not very powerful engines, often take off with ballast thus heavy and you better do your calculations with gliders too....