Match the following :

Oxide	Nature
(a) $\mathrm{CO}$	(i) Basic
(b) $\mathrm{BaO}$	(ii) Neutral
(c) ${\mathrm{Al}}_2{\mathrm{O}}_3$	(iii) Acidic
(d) ${\mathrm{Cl}}_2{\mathrm{O}}_7$	(iv) Amphoteric

Which of the following is correct option?

• Correct answer
  A

  (a)-(ii); (b)-(i); (c)-(iv); (d)-(iii)
• B

  (a)-(iii); (b)-(iv); (c)-(i); (d)-(ii)
• C

  (a)-(iv); (b)-(iii); (c)-(ii); (d)-(i)
• D

  (a)-(i); (b)-(ii); (c)-(iii); (d)-(iv)

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