Match the following species with their respective conjugate acids:

Species	Conjugate acid
$ (a) NH_{3} $	$ (i) H_{2}CO_{3} $
$ (b) HCO_{3}^{-} $	$ (ii) H_{3}O^{+} $
$ (c) H_{2}O $	$ (iii) NH_{4}^{+} $
$ (d) HSO_{4}^{-} $	$ (iv) H_{2}SO_{4} $

• A
  $(a$ $\rightarrow iii), (b$ $\rightarrow i), (c$ $\rightarrow ii), (d$ $\rightarrow iv)$
• B
  $(a$ $\rightarrow i), (b$ $\rightarrow iii), (c$ $\rightarrow ii), (d$ $\rightarrow iv)$
• C
  $(a$ $\rightarrow iii), (b$ $\rightarrow ii), (c$ $\rightarrow i), (d$ $\rightarrow iv)$
• D
  $(a$ $\rightarrow iii), (b$ $\rightarrow ii), (c$ $\rightarrow iv), (d$ $\rightarrow i)$