In which color the coolest stars are appeared?

Correct Answer: C. Red

The coolest stars are generally associated with the color red. Option C, “Red,” is the correct answer. Red stars typically have lower surface temperatures compared to other stars, such as blue or yellow stars. Cooler stars emit more red light, while hotter stars emit more blue light. The color of a star is an indication of its surface temperature, with red stars being cooler than blue stars.