If value on a sphere changes suddenly like a hard band what correction is most suitable?

Correct answer: Create a gradual value transition

The correct answer is A: create a gradual value transition. A sphere is a curved form, so the visible change from light to shadow generally needs to turn smoothly across its surface. A sudden hard band interrupts that turning effect and can make the sphere look flat, cut, or angular. The correction is to blend the values through a highlight, middle tone, and shadow, while keeping the light source consistent. B changes the contour but does not repair the tonal modelling inside the sphere. C changes the basic colour, not the abrupt light-dark transition. D removes surrounding information and leaves the shading problem unchanged. The transition should not be equally soft everywhere if a cast shadow or sharp edge is intended, but the question describes a curved sphere and an unwanted band. Memory cue: round forms usually need smooth tonal turning.