Which of the Following Causes Seasons to Occur on Earth

Multiple Choice

Which of the following causes seasons to occur on Earth?

A) the variation in proximity of the Earth to the sun at different times of the year
B) the angle of Earth's axis with respect to the sun, combined with its orbit around the sun
C) the distance between the Earth and the sun in winter versus in the summer
D) the variation or wobble of Earth's tilt during the year