For `H_3 PO_3` and `H_3 PO_4`, the correct choice is
For `H_3 PO_3` and `H_3 PO_4`, the correct choice is
A. `H_(3)PO_(3)` is dibasic and reducing
B. `H_(3)PO_(3)` is dibasic and non-reducing
C. `H_(3)PO_(4)` is tribasic and reducing
D. `H_(3)PO_(3)` is tribasic and non-reducing.
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