Plz help!! How many total oxygen atoms are present in the reaction below? (note that it is unbalanced)

C3H7OH + O2 -> CO2 + H2O

answer; i believe the correct answer is (solid gold);

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.