About 74% of the sun's mass is:
-
Oxygen
-
Helium
-
Hydrogen
-
Carbon
C
Correct answer
Explanation
The Sun's composition is primarily hydrogen (about 74% by mass, 92% by volume) with helium making up most of the remainder (about 24-25% by mass). Hydrogen is the fuel for the nuclear fusion reactions that power the Sun. Oxygen and carbon are present only in trace amounts (less than 1% combined).