The following characteristic curves (P, Q, R, S) pertain to rotary drilling in rock.

Title of the curve
I : Torque versus RPM
II: Rate of penetration versus uniaxial compressive strength of rock
III : Rate of penetration versus weight on bit
IV : Specific energy versus weight on bit
Match the curves with their titles

A. P-III, Q-IV, R-II, S-I

B. P-II, Q-IV, R-I, S-III

C. P-IV, Q-III. R-II, S-I

D. P-I, Q-III, R-II, S-IV

Answer: Option C