How can an expert artist avoid monotony in a monochromatic composition?

Correct answer: Through controlled variation in value, edge, texture, and scale

A monochromatic composition uses one colour family, which creates unity but can become dull if every visual property is identical. The artist can maintain interest by varying value, edge quality, texture, and scale in a controlled way. Option A is correct because it preserves the colour relationship while adding purposeful variety. Adding many colour families would abandon the monochromatic structure.