A. freshwater fishing.
my reasoning:
Inside the Middle East, most countries have large supplies of oil, (which helps make the countries rich as they are today because of oil demands), which takes out the options C & D. The Middle East, is located within the Sahara desert, and so can contribute to desert research (B) as well.
So A, is your most logical choice.
hope this helps
Referendum or maybe it could be this onstitutional grant<span> of </span>powers<span> that </span>enables each<span> of the </span>three branches<span> of </span>government<span> to </span>check some acts<span> of the </span>others<span> and </span>therefore ensure<span> that </span>no branch can dominate. and then maybe Referendum
