When in Total Lunar Eclipse, the Moon Shows a Reddish

When in total lunar eclipse, the Moon shows a reddish color because

A) the Moon is illuminated only by the residual glow from the dark side of Earth, which is predominantly red.
B) only the red part of the solar spectrum is deflected onto it by Earth's atmosphere.
C) the red light is the residual thermal glow from a still-warm Moon, after the abrupt removal of the heat of the Sun.
D) light from the northern and southern lights (the aurora) on Earth, which are predominantly red, illuminates the Moon.