Step 1: National Mission on Enhanced Energy Efficiency (NMEEE).
\n- Objective: To enhance energy efficiency in energy-intensive industries. \n- Specific focus: reducing energy consumption in major industries via programs like PAT (Perform, Achieve and Trade). \n\[\nP \Rightarrow 3\n\] \n\n \n
Step 2: National Mission on Sustainable Habitat.
\n- Focus: urban planning, transportation, and waste management. \n- Includes implementation of vehicle fuel economy standards through economic incentives to cut emissions. \n\[\nQ \Rightarrow 5\n\] \n\n \n
Step 3: National Water Mission.
\n- Goal: To boost water use efficiency by 20% via pricing and demand management. \n- Thus, objective = achieve a 20% increase in water use efficiency through pricing. \n\[\nR \Rightarrow 4\n\] \n\n \n
Step 4: National Mission on Strategic Knowledge for Climate Change.
\n- Focus: R&D, skill development, and establishing climate research funds. \n- Objective = obtain a deeper understanding of climate science and its effects. \n\[\nS \Rightarrow 1\n\] \n\n \n
Step 5: Final alignment.
\nConsequently, the correct order is: \n\[\nP-3, \; Q-5, \; R-4, \; S-1\n\] \n\nThis corresponds to Option (A). \n\n \n
Final Answer: \n\[\n\boxed{\text{(A) P-3, Q-5, R-4, S-1}}\n\]