The gist of the story is if you work hard even when there are plenty of resources (in this case food) you'll have enough to survive the winter when resources are scarce. Needless to say, the ants survived the winter fine as they were prepared, whereas the grasshopper died since he didn't have any food reserves. Be prepared for the worst, save when you can, so that when you need it, you have enough to survive the harsh times.
The answer is A. You do not want to overdo the information you are giving, so you should limit it to one paragraph. <span />