Which word equation describes a nuclear fusion reaction?

Question

hydrogen-2 plus hydrogen-2 yields hydrogen-4
hydrogen-2 plus hydrogen-2 yields helium-4
hydrogen-1 plus hydrogen-1 yields hydrogen-2
hydrogen -1 plus hydrogen-1 yeilds helium-2

Answer 1

I say H2 + H2 = He4

Each Hydrogen element has 1 proton, and you chose 2 electrons, which is Deuterium. When fused, you get Helium-4.

BTW: If you tried to fuse H1 +H1, you might end up with He2, which is Diproton, but it is unstable, and considered nonfusable.

Answer 2

the second one,

hydrogen 2 + hydrogen 2 --> helium 4