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Which of the follow ing on the addition ...

Which of the follow ing on the addition will cause deep red colour to disappeared ?
`underset("pale yellow")(Fe_(aq)^(3+)) + underset("colourless")(SCN_(aq)^(-)) hArr underset("deep red")([ Fe (SCN) ]_(aq)^(2+))`

A

`AgNO_(3)`

B

`HgCl_(2)`

C

`H_(2)C_(2)O_(4)`

D

`H_(2)O`

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A, B, C
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