The Sun mainly consists of ___.
-
helium
-
hydrogen and oxygen
-
molten metal elements
-
hydrogen and helium
D
Correct answer
Explanation
The Sun's composition is primarily hydrogen (about 73% by mass) and helium (about 25% by mass), with trace amounts of heavier elements. This composition reflects the primordial material from which the Sun formed and the nuclear fusion process that converts hydrogen to helium. Option A (helium alone) and B (hydrogen and oxygen) are incomplete; C (molten metal elements) is incorrect.