What weakness can occur if every edge of a cube is made blurry?

Correct answer: The planes and edges may become less clear

A cube depends on clearly organized flat planes and directional edges. These edges tell the viewer where one plane ends and another begins, while changes in value help separate the planes under a chosen light source. If every edge is blurred equally, important structural transitions lose definition. The drawing may look soft, uncertain, or poorly constructed, and the cube’s geometry may become difficult to read. Option A is correct because it identifies the loss of plane and edge clarity. B is too absolute and softness does not guarantee realism. C is false because blurring does not change the object into a sphere. D is also false: unclear edges can weaken, rather than automatically increase, the sense of depth.