What is one disadvantage of shading with excessive pressure?

Correct answer: The graphite may become difficult to erase

The governing concept is controlled graphite application. Excessive pressure forces graphite into the paper fibres and can flatten or damage the surface, so the dark mark may become difficult to erase or modify. Heavy pressure normally produces a darker, not lighter, tone, and it does not preserve the pencil point. Therefore, option D identifies the real disadvantage. A better method is to build dark values gradually with light layers.