"Given the darkening sky, the sudden drop in temperature, and strong winds, it is highly likely that a rainstorm is imminent in Exville today."
- Analysis: This statement lists observable conditions—darkening sky, sudden temperature drop, and strong winds—and concludes that a rainstorm is "highly likely." These are classic physical signs of impending rainfall, and the question only requires "possible signs," not certainty. The statement doesn’t rely on Statement (1) to make sense and directly provides a list of signs tied to a probable rain event. Thus, Statement (2) alone is also sufficient to answer the question.
Combined Analysis:
- Both statements independently provide distinct sets of possible signs of impending rainfall. Statement (1) gives forecast-based signs (heavy cloud cover, low-pressure systems), while Statement (2) gives real-time observational signs (darkening sky, temperature drop, strong winds). The question doesn’t require both types of data—it just asks for "some possible signs," which each statement delivers on its own.
Conclusion:
- Statement (1) alone is sufficient: It provides specific signs (heavy cloud cover, low-pressure systems) tied to a correct 90% rain forecast.
- Statement (2) alone is sufficient: It provides specific signs (darkening sky, temperature drop, strong winds) tied to a high likelihood of rain.
Since each statement alone is sufficient, the answer is:
D: Each statement alone is sufficient.