It is CO2 because the oxygen compounds is 2 out of three.
Answer:
CU
Explanation:
Cu is the correct answer if I'm correct
<u>Answer</u><u>:</u>
Hydrocarbon and oxygen
<u>Explanation</u><u>:</u>
"a substance reacts with oxygen gas, it must involve O² as one of the reactants."
Using this, we can confirm Hydrocarbon and oxygen is a valid one.