Final answer:
William Herschel discovered both the planet Uranus and infrared radiation, which is a type of energy that exists in the electromagnetic spectrum beyond the visible light range.
The correct option is c.
Step-by-step explanation:
The person who discovered the planet Uranus and infrared radiation is William Herschel. In 1800, while trying to measure the temperatures of different colors of sunlight spread out into a spectrum, Herschel noticed an increase in temperature beyond the red part of the spectrum.
This led him to discover infrared radiation, marking the first known energy band of the electromagnetic spectrum beyond visible light. His detection of an invisible form of energy coming from the sun was a significant step toward our current understanding of the electromagnetic spectrum.
The correct option is c.