What problem occurs if a cuboid's depth is shown too much?

Correct answer: Proportion can look distorted and unnatural

The depth of a cuboid must be shown in a believable proportion to its length and height. If the receding dimension is exaggerated, the side plane may appear excessively long or wide, and the object can look stretched, distorted, or inconsistent with the chosen viewpoint. Thus, option A is correct: too much depth can make the proportion unnatural. Option B is false because increasing one dimension cannot automatically make a drawing accurate. Option C is unrelated; the amount of form shadow depends mainly on the light source and surface orientation. Option D is also unrelated, since a drawn depth does not change the physical thickness of the paper. Accurate construction requires comparing all dimensions, maintaining consistent perspective lines, and checking the cuboid as a complete form rather than judging one plane in isolation.