Which of the following reactions is a redox reaction?

  • A
    $P_2O_5 + 2H_2O \to H_4P_2O_7$
  • B
    $2AgNO_3 + BaCl_2 \to 2AgCl + Ba(NO_3)_2$
  • C
    $BaCl_2 + H_2SO_4 \to BaSO_4 + 2HCl$
  • D
    $Cu + 2AgNO_3 \to 2Ag + Cu(NO_3)_2$

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