Explanation:

- Option 1: Hydrogen

- Hydrogen is the most abundant element in the universe.

- It makes up about 74% of the universe's elemental mass.

- Found primarily in stars and interstellar space.

- Option 2: Oxygen

- Oxygen is the third most abundant element in the universe.

- Essential for life on Earth but less common cosmically than hydrogen or helium.

- Option 3: Nitrogen

- Nitrogen is relatively abundant on Earth but not in the universe.

- It ranks lower in cosmic abundance compared to hydrogen, helium, and oxygen.

- Option 4: Helium

- Helium is the second most abundant element in the universe.

- Found in stars and accounts for about 24% of the elemental mass.