Concept:Twilight and dawn are caused by atmospheric scattering of sunlight, not by the Earth’s spherical shape.
Explanation:Sunrise and sunset occur at different times in different places because the Earth is curved.
Ships visibility proves sphericity: a ship appears hull-first, then mast, as it approaches over the curved horizon.
A lunar eclipse shows the Earth’s circular shadow on the Moon, which is only possible if the Earth is spherical.
Twilight and dawn happen because the atmosphere bends and scatters sunlight after the Sun has set or before it rises.
This does not depend on the Earth being spherical, so it is not a proof of the Earth’s shape.
Answer:Option D — twilight and dawn.