Match the casting defects (Group A) with the probable causes

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Match the casting defects (Group A) with the probable causes (Group B):
Group-A
P. Hot tears
Q. Shrinkage
R. Blow holes
S. Cold shunt
Group-B
1. Improper fusion of two streams of liquid metal
2. Low permeability of the sand mould
3. Volumetric contraction both in liquid and solid stage
4. Differential cooling rate

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

Correct Option: B

P – 3, Q – 4, R – 2, S – 1