Final Answer:
Cirrus and Cumulonimbus are cloud that indicates TCU or CB clouds to come. Therefore final answer is c. both a and b.
Step-by-step explanation:
Clouds can provide valuable information about upcoming weather conditions. Cirrus clouds (option a) are high-altitude clouds that often precede a change in the weather, indicating the approach of a warm front and potential atmospheric instability. Cumulonimbus clouds (option b) are towering clouds associated with thunderstorms and can signal severe weather.
Cirrus clouds, with their wispy appearance, typically appear at higher altitudes and can indicate the presence of an approaching warm front. As these clouds often precede a change in weather, they are considered a sign of atmospheric instability.
On the other hand, Cumulonimbus clouds, characterized by their towering structure, are associated with thunderstorms and can bring heavy precipitation, thunder, lightning, and even severe weather. Their development signals an increased likelihood of convective activity in the atmosphere.
Therefore, the correct answer is option c, as both Cirrus and Cumulonimbus clouds can provide indications of changing weather patterns. While Cirrus clouds suggest atmospheric instability associated with warm fronts, Cumulonimbus clouds signal the potential for thunderstorms and more turbulent weather conditions.
Therefore final answer is c. both a and b.