I think the answer is C. interdependence.
Interdependence of a society or a macroeconomy is where people depend on other people to produce most of the goods and services. As business becomes more and more international, the world is increasingly interdependent, with countries needing each other's help to survive. In this case, other countries which do not produce rice rely on china and southeast Asia countries for rice and these countries may also obtain other commodities they dont produce from other countries.
Answer: The basic answer could be because of the tectonics plates.
Explanation: Because when two forces act towards each other from opposite sides, rock layers are bent into folds.