Which of the following elements occurs the most abundantly in our universe?

Hydrogen

The correct answer is Option (1) - Hydrogen

Hydrogen is more plentiful than any other element making up about 3/4th the mass of the universe. Helium is second making up almost all of the remaining 25%. Oxygen is the third most abundant element in the universe. On earth, oxygen is the most common element making up about 47% of earth's mass.