The correct option is B Densely populated
The countries that are densely populated in the world has more than 200 persons
on every sq km. These are the North -Eastern
part of U.S.A., North-Western part of Europe,
South, South-East and East Asia. The marginal lands in many parts of South and East Asia have been brought under cultivation, and many former pastoral ranges in Southwest and Central Asia are now irrigated, the broad ecological factors touched upon above have continued to give rise to geographic variations in population and economic activity.