Step 1: Understanding the Concept:
Human geography has evolved through various philosophical and methodological phases. Starting from simple descriptions during the colonial era, the subject moved towards scientific laws and later to social and humanist critiques. Understanding this sequence is fundamental to the study of the history of geographical thought.
Step 2: Detailed Explanation:
The chronological evolution of approaches in human geography is as follows:
1. Regional Analysis (B): This was prominent during the late 19th and early 20th centuries (the Colonial period). Geographers focused on exploring regions and understanding the unique features of each area.
2. Regional Differentiation (D): Becoming dominant in the 1930s (inter-war period), this approach focused on "areal differentiation"—explaining why and how regions differed from one another.
3. Spatial Organization (A): Emerging in the late 1950s and 1960s, this phase was known as the "Quantitative Revolution." It used mathematical models and physics-based laws to explain spatial patterns and location of activities.
4. Radical Approach (C): Rising in the 1970s, this approach used social theories (like Marxism) to explain issues of poverty, inequality, and deprivation. It was a reaction to the perceived "dehumanization" of the spatial organization phase.
The correct sequence is: B (Colonial) $\rightarrow$ D (1930s) $\rightarrow$ A (1960s) $\rightarrow$ C (1970s).
Step 3: Final Answer:
The correct chronological order of development for these geographical approaches is B, D, A, C. Hence, option (d) is correct.