(D) As we move down the group in the periodic table,the atomic size increases due to an increase in the principal quantum number.Oxygen $(O)$,sulfur $

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(D) As we move down the group in the periodic table,the atomic size increases due to an increase in the principal quantum number.Oxygen $(O)$,sulfur $(S)$,selenium $(Se)$,and tellurium $(Te)$ all belong to Group $16$ of the periodic table.Since $Te$ is at the bottom of this group,it has the largest atomic size.Thus,the correct option is $(D)$.