Which statement correctly contrasts the differential rate law and the integrated rate law?

• A. Differential rate law expresses instantaneous rate as a function of concentrations.
• B. Integrated rate law expresses instantaneous rate as a function of concentrations.
• C. Differential rate law expresses concentrations as a function of time.
• D. Integrated rate law expresses concentrations as a function of initial conditions only.

Answer: (A)