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(C) The $IE$ increases along a period and decreases down the group.Group $15$ elements have a half-filled $p$-subshell $(ns^2 np^3)$,which provides ex

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$(Ne) 3s^2 3p^3$

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(C) The $IE$ increases along a period and decreases down the group.Group $15$ elements have a half-filled $p$-subshell $(ns^2 np^3)$,which provides extra stability compared to group $16$ elements $(ns^2 np^4)$.Comparing the given electronic configurations:Option $A$ is $Al$ $(3s^2 3p^1)$,Option $B$ is $S$ $(3s^2 3p^4)$,Option $C$ is $P$ $(3s^2 3p^3)$,and Option $D$ is $Ge$ $(4s^2 4p^2)$.Since $P$ has a stable half-filled configuration,it possesses the highest $IE$ among the given options.

Among the following elements,the one having the highest ionisation energy is :-

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