With reference to furnace oil, consider the following statements : 1. It is a product of oil refineries. 2. Some industries use it to generate power. 3. Its use causes sulphur emissions into environment. Which of the statements given above are correct?

1. Statement 1 is correct. Furnace oil, also known as heavy fuel oil (HFO) or residual fuel oil, is a fraction obtained from petroleum distillation, either as a distillate or a residue. It is indeed a product of oil refineries. 2. Statement 2 is correct. Furnace oil is commonly used as a fuel in industrial furnaces, boilers, and engines to generate heat or power. Many industries, including power plants, cement factories, and shipping, utilize it. 3. Statement 3 is correct. Crude oil naturally contains sulphur compounds, which get concentrated in heavier fractions like furnace oil during refining. The combustion of furnace oil releases this sulphur primarily as sulphur dioxide (SO2), a significant air pollutant contributing to acid rain and respiratory problems. Its use causes sulphur emissions into the environment. Since all three statements are correct, the answer is (D).