Answer: Basically, we use water at a faster rate than it can be renewed. Therefore it's availability becomes more limited.
Explanation:
"It was divided among his grandsons and was weakened by internal power struggles" is the one among the following choices given in the question that describes the happening <span>to Charlemagne's empire after his death. The correct option among all the options that are given in the question is the fourth option or option "d".</span>
