I believe it is both C and D
Earth's shadow covering the moon
Earth's orbit and moon's orbit occasionally aligning
Solar and Lunar eclipse occur when the Sun, the earth and the moon align in a single line. When sun comes in between the sun and the moon, lunar eclipse occurs and when moon comes in between the sun and the Earth, solar eclipse occurs.
In Solar eclipse, Earth passes through the shadow of the moon. In Lunar eclipse, Moon passes through the shadow of the Earth.
An eclipse happens when one astronomical body blocks light from or to another.
The Moon moves into the shadow of Earth cast by the Sun. When the Moon passes through the outer part of Earth’s shadow—the penumbra, where the light of the Sun is only partly extinguished—the Moon dims only slightly in what is called a penumbral eclipse. When the Moon passes through the central part of Earth’s shadow—the umbra, where the direct light of the Sun is totally blocked—the lunar eclipse is considered partial if the Moon is partly within the umbra or total if the Moon is completely within it.
Earth’s orbit and moon’s orbit occasionally aligning
A lunar eclipse is triggered when the Moon goes through the Earth's shadow.
Because the Sun, Earth, and the Moon have to be positioned in a linear position in order to make this to happen, however, lunar eclipses can only happen at the time of a full moon.
A solar eclipse happens when the Moon moves amid the Sun and the Earth and casts its shadow on the Earth’s face.