$PS-I$ in cyclic photophosphorylation is involved in the formation of ...$A$... by ...$B$... movement of electrons. What do $A$ and $B$ refer to here?

  • A
    $A-ATP$; $B$-downhill redox potential
  • B
    $A-ADP$; $B$-uphill redox potential
  • C
    $A-NADH + H^{+}$; $B$-downhill energy
  • D
    $A-NADPH + H^{+}$; $B$-downhill energy

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