Below a question is given with two statements (I) and (II). These statements may be either independent causes or may be effects of independent causes or a common cause. One of these statements may be the effect of the other statement. Read both the statements and decide which of the following answer choice correctly depicts the relationship between these two statements. I: Burning of fossil fuels adds carbon dioxide to the air. II: Sewage and wastewater are released into the rivers. Correct Answer Both I and II are independent causes. Answer: Option 3. Both I and II are independent causes. Burning of fossil fuels emits carbon dioxide and hence causes global warming. Sewage and wastewater which is released into the water causes water pollution. So both can be termed as independent causes.