- P. Wajrakarur is known for its diamond deposits, so the correct match is P-2.
- Q. Sukinda is known for its chromite deposits, so the correct match is Q-1.
- R. Malanjkhand is known for its copper deposits, so the correct match is R-4.
- S. Mangampeta is known for its barite deposits, so the correct match is S-3.
Thus, the correct matching is P-2; Q-1; R-4; S-3, corresponding to option (C).
Final Answer:
\[
\boxed{(C)}
\]