(B) By the law of identity,for any element $x$,it must be true that $x = x$. Since the condition given is $x \ne x$,there is no element $x$ that can s

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(B) By the law of identity,for any element $x$,it must be true that $x = x$. Since the condition given is $x \ne x$,there is no element $x$ that can satisfy this condition. Therefore,the set $A$ contains no elements. $A$ set with no elements is called an empty set or a null set,denoted by $\{\}$ or $\phi$.