Ans:- option B
$S_1, S_2,\ldots ,S_n$ can be considered as premises and S is conclusion. Argument $premises\implies conclusion$ is said to be valid(TRUR) if $S_1,S_2,S_3,\ldots,S_n \rightarrow S$ is valid. (False $\rightarrow $ or True $\rightarrow $ True.)