Why Did Earth's Earliest Atmosphere, Composed Primarily of Hydrogen and Helium

Why did Earth's earliest atmosphere, composed primarily of hydrogen and helium, NOT last long?

A) Hydrogen is highly reactive, and it soon became bound into chemical compounds in Earth's rocks.
B) Hydrogen and helium are light gases, and they soon escaped into space.
C) Biological activity very quickly combined the hydrogen with oxygen to form water.
D) The hydrogen soon became dissolved in Earth's oceans.

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