Final answer:
In the context of the integrated rate law for first-order reactions, the correct parts labeled are (c) Concentration and time, as they relate to the rate of reaction and how it changes over time.
Step-by-step explanation:
The integrated rate law for first-order reactions relates the concentration of a reactant to time. The labels in this law are c) Concentration and time. In the context of first-order reactions, the rate of reaction is directly proportional to the concentration of the reactant. The formula for a first-order integrated rate law typically has the form ln([A]) = -kt + ln([A]0), where [A] is the concentration of the reactant at time t, [A]0 is the initial concentration, k is the rate constant, and t is the time.