The correct answer is C) They would be angry because such development would severely limit their only access to freshwater in the region.
If Turkey were to build twenty more dams on these rivers, this most likely affects Syria and Iraq in that they would be angry because such development would severely limit their only access to freshwater in the region.
Turkey, Syria, and Iraq have been faced with water problems since many years ago. Water is a scarce resource in the Middle East due to desert conditions and is a big issue for these countries. Syria, Turkey, and Iraq have not reached an agreement on a water settlement over the Rivers Tigris and Euphrates because Syria and Turkey have built dams to generate electricity and store water, and this reduces the water supply in Iraq. So the real thing is that each country has its own interests and agendas and neither of them has considered the other nation's necessities in order to reach a fair agreement for the three of them.