In the question below, two statements (

• I and (I
• I are given. 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 choices correctly depicts the relationship between these two statements. I. The municipal authorities have reported a significant decrease in the number of water-borne disease cases in the city over the last three months. II. The city administration recently completed a massive project to overhaul the old sewage system and install high-grade water purification plants.