The correct answer is A. A little.
A crow can survive on a very small amount of water. In fact, a crow can go for up to three days without drinking any water at all. This is because crows are able to get most of the water they need from the food they eat.
The other options are incorrect because they suggest that a crow would need a lot of water to survive. However, as I have explained, a crow can survive on a very small amount of water.
A little water was in a jug so a crow survived. This means that the crow was able to find enough water to survive, even though there was only a small amount of water in the jug. This is an example of how crows are very adaptable animals. They are able to survive in a variety of environments, including environments where there is very little water.