(C) In quantum mechanics,the azimuthal quantum number $(l)$ determines the shape of the orbital and the subshell type.For $l = 0$,the subshell is $s$.

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(C) In quantum mechanics,the azimuthal quantum number $(l)$ determines the shape of the orbital and the subshell type.For $l = 0$,the subshell is $s$.For $l = 1$,the subshell is $p$.For $l = 2$,the subshell is $d$.For $l = 3$,the subshell is $f$.Therefore,a subshell with $l = 2$ is called a $d$-subshell.