See the following chemical reaction:
$Cr_2O_7^{2-} + XH^{+} + 6Fe^{2+} \rightarrow YCr^{3+} + 6Fe^{3+} + ZH_2O$
The sum of $X$,$Y$ and $Z$ is $.......$.

  • A
    $22$
  • B
    $21$
  • C
    $20$
  • D
    $23$

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Assign $A$,$B$,$C$,$D$ from the given type of reaction.
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