I need an answer asap you will be mark brainiest

Answer:
It's the third option
Explanation:
It's the third option because [tex]1N_{2}[/tex] (which is 1 nitrogen gas) + [tex]3H_{2}[/tex] (which is 3 hydrogen gas) = [tex]2NH_{3}[/tex] (which is 2 nitrogen hydrogen gas) so thus it's the 3rd option
I hope that my answer helped you and I'd really appreciate it if you mark my answer the brainliest! :)