Arrange the following theories in ascending order according to the year they were propounded:

A. Central Place Theory – Christaller
B. Concentric Zone Model – Burgess
C. Sector Theory – Hoyt
D. Multiple Nuclei Model – Harris & Ullman

Choose the correct answer from the options below:

Correct option is C

The correct chronological order of these urban theories is:

B. Concentric Zone Model – Ernest Burgess (1925)

• Proposed that cities grow in concentric rings outward from the central business district (CBD).
• Used to explain urban structure and land-use patterns in cities.

A. Central Place Theory – Walter Christaller (1933)

• Focused on spatial distribution of cities and towns.
• Explained how settlements are arranged in a hierarchy based on their services.

C. Sector Model – Homer Hoyt (1939)

• Improved Burgess’s model by showing that cities develop in sectors or wedges, not just rings.
• Explained urban growth along transportation routes.

D. Multiple Nuclei Model – Harris & Ullman (1945)

• Suggested that cities develop multiple centers (nuclei), each serving a different function.
• Explained modern urban decentralization.

Thus, the correct sequence is:
B (1925) → A (1933) → C (1939) → D (1945)