(D) The representative elements are the $s$-block and $p$-block elements (excluding noble gases). $Aluminium$ $(Al)$ has the atomic number $13$ and it

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(D) The representative elements are the $s$-block and $p$-block elements (excluding noble gases). $Aluminium$ $(Al)$ has the atomic number $13$ and its electronic configuration is $[Ne] 3s^2 3p^1$. Since it belongs to the $p$-block,it is a representative element. $Lanthanum$ is a $d$-block element,$Chromium$ is a $d$-block element,and $Argon$ is a noble gas.