Final answer:
Incomplete combustion typically results in the formation of carbon monoxide (CO), with limited oxygen preventing the formation of carbon dioxide (CO2).
Step-by-step explanation:
Incomplete combustion typically results in the formation of carbon monoxide (CO), as there is not enough oxygen available to produce carbon dioxide (CO2).
The incomplete combustion reaction of methane can be represented as 2CH4 + 3O2 → 2CO + 4H2O, which shows the production of CO and water rather than CO2 and water which are the products of complete combustion. In conditions where even less oxygen is available, solid carbon or soot may be formed along with CO. Thus, the correct answer is b) CO.