Answer:
D) Earth's shadow on the moon shows it is spherical.
Explanation:
According to ancient astronomers, Earth was flat. But it was eventually proved wrong.
1. Had Earth been flat, ship in the sea could be seen for a far distance but it is not so.
2. During the lunar eclipse, the shadow of the Earth falling on moon would have been flat or would have sharp edges. But, the shadow was found to be round in shape. A spherical object casts a round shadow.
Thus, option D is correct.