$\mathrm{A}, \mathrm{B}, \mathrm{C}, \mathrm{D}$ and E are elements with atomic numbers $13,11,9,7$ and 16 respectively. Among these elements, ion of an element X has largest size and ion of an element Y has smallest size. X and Y are respectively (Assume that all ions have nearest inert gas configuration)

• A

  $\mathrm{D}, \mathrm{A}$
• B

  $\mathrm{A}, \mathrm{D}$
• Correct answer
  C

  $\mathrm{E}, \mathrm{A}$
• D

  $\mathrm{D}, \mathrm{E}$

Hence, the correct answer is option: 'C'.