I think the answer is B.
Because one of the factors that has prevented it from being a more unified country is its geography. It's rugged, mountainous. It's very difficult for any invading army to develop or control it.
Miscegenation. Hope this helps:)
Plate tectonics,millions of years of the earth being pushed up by earthquakes
Oceanography but the study of ocean creatures is Marine Biology
An Nafud is the correct answer
