Match the heat treatment processes (Group A) and their associated effects on properties
(Group B) of medium carbon steel:
Group A Group B
P: Tempering I: Strengthening and grain refinement
Q: Quenching II: Inducing toughness
R: Amealing III: Hardening
S: Normalizing IV: Softening
(A) P-III, Q-IV, R-II, S-I (B) P-II, Q-III, R-IV, S-I
(C) P-III, Q-II, R-IV, S-I (D) P-II, Q-III, R-I, S-IV