Step 1: Understanding the question.
The question involves matching sedimentary features with their respective environments based on geological processes.
Step 2: Analyzing the options.
(A) P-3 Q-4 R-1 S-2: This combination is incorrect, as it mismatches the environments with the features.
(B) P-2 Q-3 R-4 S-1: This combination is also incorrect.
(C) P-2 Q-1 R-3 S-4: Correct — Point bars form in meandering fluvial channels, barchans are characteristic of aeolian environments, dropstones are found in glacial environments, and herring-bone cross stratification is typically found in tidal environments.
(D) P-2 Q-3 R-1 S-4: This is also incorrect based on the sedimentary environments.
Step 3: Conclusion.
The correct answer is (C) P-2 Q-1 R-3 S-4, as it correctly matches the sedimentary features with their respective environments.