Answer:
It would be the 3rd option, "It is mostly desert, with very little fresh water."
Explanation:
Arabia is not a very fertile area, although north of Arabia lies Iraq with the Tigris and Euphrates rivers which is a very fertile area and has been cultivated agriculturally for thousands of years. Arabia is not heavily forested whatsoever, and has no significant locations of high elevation. The last option can be eliminated as there is no large river or river delta located in Arabian lands.
