The data in the table concern the lactonization of hydroxyvaleric acid at 25 degrees Celsius. They give the concentration $C(t)$ of this acid in moles per liter after $t$ minutes.

Find the average rate of reaction for the following time intervals:

(a) $2 \leq t \leq 6$, (b) $2 \leq t \leq 4$, (c) $0 \leq t \leq 2$

(By plotting a graph, can you see why the instantaneous rate of change is approximately -.01 (moles/L)/min?)

(a) (moles/L)/min
(b) (moles/L)/min
(c) (moles/L)/min