blue Based on the information given: - John's car is blue - Sarah's car is the same color as the sky on a clear day - The sky is not green on a clear day - Peter's car is red Therefore, since Sarah's car is the same color as the clear blue sky, and blue is not the color of a green sky, it logically follows that Sarah must own a blue car. No other color is explicitly mentioned as being the color of her vehicle or the sky's hue. The text provides enough clues to infer with confidence that Sarah drives a blue car, matching the shade of a clear day sky. This is the only color mentioned for both her automobile and the heavens. So the answer is blue. Let me know if you would like me to elaborate further on this simple inference process based on the information provided. I aimed to break it down in an easy to understand way. Thanks!