Read the short story below and answer the following question: 

The thirsty Crow

On a summer afternoon, a crow felt thirsty. It looked here and there but could not find a single drop of water. After a long time, it found a pitcher. There were few drops of water inside this. But the crow could not reach that water. It started to feel more thirsty. The crow again looked at its surroundings and found some pebbles nearby. So it took the pebbles one by one and started to drop them inside the pitcher. Then the water level started to increase. When the crow finally dropped all the pebbles, the water level reached the pitcher's top. The crow drank the water and finally quenched the hard thirst.

Adapted from: https://butterflyfields.com/blogs/parentingtips/top-10-amusing-moral-short-stories-in-english-for-kids/ What sentence better describe the moral of that story: