Final answer:
The relationship between the rate of change, with respect to time (dU/dt), and the rate of change, with respect to time (dN/dt), of N is given by the equation: dU/dt = k / (dN/dt). The correct option is A. dU/dt = k / (dN/dt).
Step-by-step explanation:
The relationship between the rate of change, with respect to time (dU/dt), and the rate of change, with respect to time (dN/dt), of N is given by the equation:
dU/dt = k / (dN/dt)
Therefore, the correct option is A. dU/dt = k / (dN/dt).