D. The argument is strong because the claim is supported by logical evidence and a counterclaim is considered.
When constructing an argument, what you’ll want to do is be as objective as possible. What this means is that even though there is an obvious opinion present by the very nature of presenting/defending a point of view, you’ll want to present information that is based on facts (logical evidence). To have an even stronger argument, what you’ll want to do, too, is present an opposing viewpoint, which you’ll either refute or concede. This will help your argument be viewed as balanced.
Because the cause of the crisis is many European countries.
D is correct. There is fish in the water which provides lots of food. Boats can go up or down the river to transport items. Water is a basic need for humans so for a population to grow you need a good water source. Hope this helps! ;)