Which statement correctly explains seasons and the effect of Earth's tilt?

Which statement correctly explains seasons and the effect of Earth's tilt?

• A. The seasons are caused by the Sun's energy output varying throughout the year.
• B. Seasons happen because the Earth orbits the Sun in a perfect circle, keeping sunlight constant.
• C. Seasons are caused by daily weather patterns and have no astronomical basis.
• D. Seasons are caused by the tilt of Earth's axis, which affects the duration and intensity of sunlight in different hemispheres.

Answer: (D)