In aqueous solution, the hydronium ion gets further hydrated to give which of the following species?

• A

  $\mathrm{H}_7 \mathrm{O}_4{ }^{+}$
• Correct answer
  B

  $\mathrm{H}_9 \mathrm{O}_4{ }^{+}$
• C

  $\mathrm{H}_5 \mathrm{O}_3{ }^{+}$
• D

  $\mathrm{H}_3 \mathrm{O}_2{ }^{+}$

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