Step 1: National Assembly Building, Dhaka (Louis Kahn).
\n- Louis Kahn designed the National Assembly (Capitol Complex) with a strong central geometric core. \n- The assembly hall is centrally located, with surrounding functions emanating from it. \n- This exemplifies a centralized organization. \n\[\nP \Rightarrow 1\n\] \n\n \n
Step 2: Secretariat Building, UNESCO HQ, Paris (Marcel Breuer).
\n- The Secretariat is a long, linear slab building. \n- Its design and layout feature a linear organization, with spaces arranged along a central axis. \n\[\nQ \Rightarrow 4\n\] \n\n \n
Step 3: Fatehpur Sikri Palace Complex (Mughal architecture).
\n- The palace complex is not organized around a central axis; instead, it expands by adding courtyards, halls, and residences around existing structures. \n- This demonstrates a clustered organization, where spaces are grouped closely without strict symmetry. \n\[\nR \Rightarrow 2\n\] \n\n \n
Step 4: Shodhan House, Ahmedabad (Le Corbusier).
\n- The house is structured around a robust orthogonal framework. \n- Its use of repeating grid-like planning elements clearly illustrates a grid organization. \n\[\nS \Rightarrow 5\n\] \n\n \n
Step 5: Match with given options.
\nThe correct sequence is: \n\[\nP-1, \; Q-4, \; R-2, \; S-5\n\] \n\nOption (A) corresponds to this sequence. \n\n \n
Final Answer: \n\[\n\boxed{\text{(A) P-1, Q-4, R-2, S-5}}\n\]