(B) In the $p$-block elements of group $13$ (Boron family),the metallic character increases as we move down the group from $B$ to $Tl$. $B$ (Boron) is

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(B) In the $p$-block elements of group $13$ (Boron family),the metallic character increases as we move down the group from $B$ to $Tl$. $B$ (Boron) is a non-metal,while $Al$,$Ga$,$In$,and $Tl$ exhibit metallic properties. Therefore,$B$ (Boron) has the least metallic character among the given options.