Match the following sand mold casting defects with their respective causes.
$\begin{array}{|l|l|l|l|} \hline \\ {} & \text{Defect} & {} & \text{Cause} \\ \hline P & \text{Blow hole} & 1 & \text{Poor collapsibility} \\ \hline Q & \text{Misrun} & 2 & \text{Mold erosion} \\ \hline R & \text{Hot tearing} & 3 & \text{Poor permeability} \\ \hline S & \text{Wash} & 4 & \text{Insufficient fluidity} \\ \hline \end{array}$
- $P-4, Q-3, R-1, S-2$
- $P-3, Q-4, R-2, S-1$
- $P-2, Q-4, R-1, S-3$
- $P-3, Q-4, R-1, S-2$