The correct answer is option 4, "White". In the context of heat radiation, the color "white" represents the highest temperature. This is because white light is a combination of all visible colors of light, including red, orange, yellow, green, blue, and violet. When an object emits white light, it means that it is radiating energy across a wide range of wavelengths, including those associated with higher temperatures.

Options 1, 2, and 3 ("Blood red," "Dark cherry," and "Salmon") are specific shades of red and are associated with lower temperatures. Red light has a longer wavelength compared to white light, indicating lower energy and lower temperatures. Generally, as the temperature of an object increases, it transitions from red to blue-white to represent higher temperatures.

It is important to note that while white light represents the highest temperature when considering heat radiation, in other contexts, such as photography, different colors may be used to indicate different temperatures.