match the parts used in casting and their purpose

Question

Match the following

Part used in casting	Purpose
P. Metallic chills	1. Support for the core
Q. Metallic chaplets	2. Reservoir of the molten metal
R. Riser	3. Control cooling of critical sections
S. Exothermic padding	4. Progressive solidification

 

(a) P-1, Q-3, R-2, S-4

(b) P-1, Q-4, R-2, S-3

(c) P-3, Q-4, R-2, S-1

(d) P-4, Q-1, R-2, S-3