Answer:
The correct answer is option D.
Explanation:
Step 1: 
Step 2: 
Overall reaction can be determined by adding all the reactions of mechanism:

Reactants in an overall reaction = 
Products in an overall reaction = 
According to question , the role of oxygen gas is product.
A;4, b;6, c;7, d;5, e;8, f;3
Answer:
oh coooool
I have one Id it is on ace with maybe 5800 points
maybe this picture will help in something