Final answer:
The common CO₂ measurement for an oil-fired furnace is 10 to 12%.
Step-by-step explanation:
The subject of this question is Chemistry.
Carbon dioxide (CO₂) is a common byproduct of the combustion of fossil fuels. It is released when fuels such as oil are burned in a furnace. The question refers to the measurement of CO₂ in an oil-fired furnace, giving a range of percentages for the measurement.
The correct answer is option b. 10 to 12%. This means that a common CO₂ measurement for an oil-fired furnace typically falls within the range of 10 to 12%. This measurement is important for ensuring the efficient and safe operation of the furnace.