Event I: Many residents of the colony fell ill with stomach infections. Event II: Tests found that the colony’s water supply was contaminated. Which option best describes the relationship between the two events?

1. A Option A: Event I is the cause and Event II is its effect
2. B Option B: Both events are independent causes
3. C Option C: Both events are effects of a common cause
4. D Option D: Event II is the cause and Event I is its effect

Answer checked 11 October 2026 · How we write and check questions