Which scheme is suitable for showing a warm sun reflection in calm water?

Correct answer: Limited yellow-orange reflection in cool blue water

The governing concept is warm-cool contrast used with a dominant colour and a controlled accent. Calm blue water establishes a cool field, while a limited yellow-orange reflection represents warm sunlight and attracts attention without destroying the water’s unity. Therefore option A is correct. All-orange water removes the contrast, blue alone lacks the warm reflection, and uniform grey cannot communicate the temperature relationship clearly.