Match the corrosion phenomenon with the material in which they are commonly observed.

P. Season cracking	1. 70 : 30 brass
Q. Pitting corrosion	2. GI water line fitted with a brass tap
R. Galvanic corrosion	3. Duralumin
S. Caustic embrittlernent	4. Boiler steel

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

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

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

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

Answer: Option A