The resistance of the series combination of two resistances is $S$. When they are joined in parallel through total resistance is $P$. If $S = nP$, then the minimum possible value of $n$ is

Question

$\begin {array} {1 1} (A)\;1 & \quad (B)\;2 \\ (C)\;3 & \quad (D)\;4 \end {array}$