Why Isn't Earth's Atmosphere Mostly Hydrogen

Why isn't Earth's atmosphere mostly hydrogen?

A) Earth formed too close to the Sun for any planetesimals to have hydrogen.
B) All the hydrogen was blasted away during the early bombardment stage of the solar system.
C) Light gases such as hydrogen move faster than heavier gases and escape from Earth's gravitational field.
D) The hydrogen is frozen in the polar ice caps.
E) All the hydrogen reacted with oxygen and formed the oceans.