Match the operations listed in Group I with the type of processes listed in Group II.

Group-I	Group-II
P. Blast Furnace Iron making	1. Refining
Q. BOF Steel making	2. Electrolysis
R. Hall-Heroult Process	3. Smelting
S. Bayer Process	4. Leaching

A. P-1, Q-3, R-2, S-4

B. P-3, Q-1, R-2, S-4

C. P-4, Q-2, R-3, S-1

D. P-3, Q-1, R-4, S-2

Answer: Option B