While sketching a cube where do receding edges of the same direction move?

Correct answer: Toward a common vanishing direction

The governing concept is perspective convergence. Edges that are parallel in the real cube and recede into depth are represented as moving toward one common vanishing direction, or toward the same vanishing point when the perspective setup permits it. They should not head toward random points, always move upward, or converge on the cube's centre. Therefore option B correctly describes their relationship.