Concept:
Urbanization patterns vary significantly across the globe. These patterns are described by the "level of urbanization" (percentage of population in cities) and the "urban hierarchy" (the size relationship between cities).
Step 1: Evaluating Statements A, B, and C.
• A. Bahrain: Several small island nations and city-states, including Bahrain, Singapore, and Kuwait, are classified as having 100% urbanization because their entire land area is developed.
• B. Trinidad and Tobago: Counter-intuitively, this nation has one of the world's lowest official levels of urbanization (often cited around 13-15%) due to specific statistical definitions of urban boundaries used there.
• C. Primate Cities: Manila (Philippines), Bangkok (Thailand), and Seoul (South Korea) are classic examples of Primate Cities—they are many times larger than the second-largest city in their respective countries and dominate national culture and economy.
Step 2: Evaluating Statement D.
Over the last century, the most explosive growth has actually occurred in Megacities and large metropolitan areas, not small cities. The shift has been toward massive urban agglomerations.
Step 3: Conclusion.
Since A, B, and C are correct and D is incorrect, the most appropriate choice is (3).