0. How far the axis of earth is inclined of its orbital surface?
The Earth's axis is tilted at an angle of approximately 23.5° to its orbital plane.
A. 23 – Correct. Tilt is about 23.5°, responsible for seasons.
B. 66 – Incorrect. Complements the tilt (90° - 23° = 67°), but not the tilt itself.
C. 180 – Incorrect. Total opposite direction, not a tilt angle.
D. It is not inclined – Incorrect. Earth is definitely tilted.