Concept:Sunrise and sunset are daily events caused by rotation, not proof that the Earth is round.
Explanation:The rising and setting of the Sun occurs because the Earth turns on its axis.
A rotating planet does not have to be spherical to show this effect.
Mercury and Venus orbit between the Sun and the Earth, so they also experience their own sunrises and sunsets.
From Earth, these two planets are seen only near the Sun in the sky, appearing as morning stars or evening stars.
Their visibility is therefore linked to sunrise and sunset times.
Since the same phenomenon is found on these other celestial bodies, sunrise and sunset cannot be used as a unique proof of Earth's spherical shape.
The curved shadow of Earth on the Moon during a lunar eclipse is a far better proof of sphericity.
The gradual disappearance of a ship's hull over the sea horizon is another strong evidence.
Answer:A. Mercury and Venus