The intensity of the Sun's radiation is decreasing. B. Natural processes on the Earth cause carbon dioxide to cycle through limestone, coal, several chemical-weathering reactions, and the atmosphere. C. The climate on Venus is a "runaway icehouse," a positive feedback that perpetually keeps the planet cold. D. The two major factors determining the Earth's temperature are the Earth-Sun distance and the concentration of oxygen in the atmosphere.

The true statement is option D. The two major factors determining the Earth's temperature are the Earth-Sun distance and the concentration of oxygen in the atmosphere.

Explanation:

The distance between the sun and the Earth is one of the factors that determines the temperature of the planet. The energy from the sun travels to the Earth, increasing the temperature.

The other fact that has a role in the Earth's temperature is the concentration of oxygen in the atmosphere. It can increase or decrease the temperature according to the amount of this. Oxigen contributes to the greenhouse effect, which helps to keep the temperature in a range that allows life to happen.