Why can it be wrong to use only colour in cloud classification?

Correct answer: Colour alone does not fully show height, form, and particle nature

Direct answer: A is correct. Cloud classification uses several observable and physical features, including height, shape, vertical development, thickness, and whether the cloud contains liquid droplets or ice crystals. Colour can change with sunlight angle, time of day, cloud thickness, shadow, atmospheric haze, and the observer’s viewpoint. A bright white cloud may be thin or thick, while a dark-looking cloud may simply be thick enough to block more light; colour alone does not identify its cloud family or precipitation potential. B is wrong because colour does not always give the cloud’s name. C is wrong because form and structure are important classification clues. D is wrong because height is central to distinguishing high, middle, and low cloud groups. Memory cue: classify clouds with more than colour—observe height, shape, thickness, and structure.