Match the cast irons in Group 1 with the distinguishing microstructural features in Group 2.

Group 1	Group 2
P. Grey cast iron	1. Temper graphite
Q. Ductile cast iron	2. Pearlite
R. Malleable cast iron	3. Graphite flakes
S. White cast iron	4. Massive cementite
	5. Nodular graphite

A. P-3, Q-5, R-4, S-2

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

C. P-2, Q-4, R-5, S-3

D. P-3, Q-5, R-1, S-4

Answer: Option D