Electronic configuration of chlorine is : 

The electronic configuration is defined as the distribution of electrons of an atom in the atomic or molecular orbitals and is written using the labels for the subshell.

The order in which electrons are filled in atomic orbitals as:

The configuration in which the outer shell is completely filled is known as noble-gas configuration as they are similar to electronic configurations of noble gases.

The Chlorine atom has an atomic number 17. It means there are total of 17 electrons in the chlorine atom. Thus, the electronic configuration is ${\mathrm{ls}}^{2}2{\text{s}}^{2}2{\text{p}}^{6}3{\text{s}}^{2}3{\text{p}}^5$ .

Hence, the correct option is (D).