Which one of the following is generally considered a cool color?

The understanding of cool and warm colors is rooted in color theory, where colors are categorized based on their visual temperature. Cool colors are typically associated with calmness, serenity, and tranquility, and generally include shades of blue, green, and purple.

In this context, green is considered a cool color along with blue. Green evokes the freshness of nature and has a soothing quality, which aligns with the characteristics of cool colors. On the other hand, colors like orange and red fall into the warm category, as they often evoke feelings of warmth, energy, and excitement.

By recognizing that green is part of the cool color spectrum based on these principles, it becomes clear why it is the correct choice in this question regarding color classification.