Which edge difference is appropriate between shiny metal and soft fabric?

Correct answer: Sharper edges in metal and softer edges in fabric

The governing concept is edge control for material description. Polished metal often produces crisp changes between highlight, reflection, and dark areas, so selected edges can be sharp. Soft fabric generally has gradual folds and diffused transitions, so its edges should be varied and softer rather than uniformly hard. Option A is correct. Equal hard edges flatten the material distinction, a black outline is an artificial shortcut, and shiny metal normally depends on highlights rather than lacking them.