From largest to smallest, which is the correct order of the atmospheric composition of Uranus?
A. Methane, Helium, Hydrogen
B. Helium, Hydrogen, Methane
C. Hydrogen, Helium, Methane
D. Methane, Hydrogen, Helium
E. Hydrogen, Methane, Helium
Answer: C. Hydrogen, Helium, Methane