Answer:
The answer to your question is: letter a
Step-by-step explanation:
a) This answer is correct because nitrogen and oxygen are diatomic.
b) This answer is incorrect because nitrogen and oxygen are monoatomic and the reactants in this reaction are not monoatomic.
c) This answer is incorrect because oxygen is diatomic and in this reaction is not.
d) This option is incorrect because nitrogen is diatomic and in this reaction is not.