For $H_3PO_3$ and $H_3PO_4$,the correct choice is:
- A$H_3PO_3$ is dibasic and reducing.
- B$H_3PO_3$ is dibasic and non-reducing.
- C$H_3PO_4$ is tribasic and reducing.
- D$H_3PO_3$ is tribasic and non-reducing.
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