Option 1 -> Characterized by a broad base (high birth rate, many young individuals) and a narrow apex (fewer elderly), indicating a growing/expanding population.
Option 2 -> Has a roughly uniform distribution across age groups with only slight narrowing at top, indicating stable birth and death rates.
Option 3 -> Features a narrow base (low birth rate, fewer young people) and broader middle-upper sections, indicating declining population growth.
Option 4 -> Similar to stationary, shows balanced age distribution with minimal population growth or decline.
Hence, Option 1: Expansive pyramid -> A broad base with many young people tapering to fewer elderly is the classic characteristic of an expansive (or progressive) pyramid, typically found in developing countries with high birth rates and growing populations -> correct