Mercury Can Be Seen Easily from Earth Only

Mercury can be seen easily from Earth only:

A) during a lunar eclipse, when the sky is sufficiently dark near the Moon, because Mercury is always close to the Moon in the sky.
B) at midnight, when it is high in the sky.
C) when Mercury is near the Sun, just after sunset or just before sunrise.
D) in the winter, when the ecliptic plane is high in the sky at night.