(A) In the Boolean algebra of logical statements,the conjunction operation is denoted by $\wedge$.We know that for any statement $p$,$p \wedge t = p =

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(A) In the Boolean algebra of logical statements,the conjunction operation is denoted by $\wedge$.We know that for any statement $p$,$p \wedge t = p = t \wedge p$,where $t$ represents a tautology.Therefore,$t$ is the identity element for the conjunction operation.Since $t = \sim c$ (where $c$ is a contradiction),the identity element is $\sim c$.