The following reaction occurs in basic solution:
OBr^—(aq) + PH₃(aq) → OH^—(aq) + PH₂Br(aq)Given the initial rate data for the reaction at 25 °C,
Determine therate law for the reaction andnumerical value of the rate constant, k, with correct units.

• A. rate = k[OBr⁻][PH₃][OH⁻]
  k = 1.2×10⁷ M⁻²·s⁻¹
• B. rate = k[OBr⁻]²[PH₃][OH⁻]
  k = 8.0×10⁸ M⁻³·s⁻¹
• C. rate = k([OBr⁻][PH₃])/[OH⁻]
  k = 0.12 s⁻¹
• D. rate = k[OBr⁻][PH₃]²[OH⁻]
  k = 6.0×10⁸ M⁻³·s⁻¹

Answer: (C)