The answer is "C", "MW".
In the given problem, the place QMW and plane RMW. These planes intersect at MW, in which intersection is either a point, line or curve that an entity or entities both possess or is in contact with but if we see in Euclidean geometry, the intersection of two planes is called a “line”. In the plane we can understand that the common line for both plane QMW and plane RMW is MW.
