The correct answer is (b), Milutin Milankovitch.
Milutin Milankovitch was a Serbian geophysicist and astronomer who proposed that the Earth’s orbit around the Sun, the tilt of the Earth’s axis, and the precession of the Earth’s axis are the main causes of climate change. These three factors, known as Milankovitch cycles, vary over time and affect the amount of solar radiation that reaches the Earth’s surface.
Robert Hooke was an English physicist, chemist, anatomist, geologist, inventor, and mechanical engineer who is considered one of the most versatile and ingenious scientists of all time. He is best known for his work on the laws of elasticity and gravitation, and for his invention of the balance spring, the universal joint, and the Gregorian telescope.
George Simpson was a Canadian meteorologist who is best known for his work on the atmosphere and climate. He was the first director of the Canadian Meteorological Service, and he served as president of the Royal Meteorological Society from 1949 to 1951.
T. C. Chamberlain was an American geologist who is best known for his work on the origin of mountains. He was the first president of the Geological Society of America, and he served as president of the National Academy of Sciences from 1904 to 1907.