The price P of gasoline increases to a maximum and then stays at a fixed price. What is the rate of change dp/dt and how is it changing at the time when the price reaches a maximum? a. dp/dt is negative at the maximum and is decreasing. b. dp/dt is equal to zero at the maximum and remains the same. c. dp/dt is positive at the maximum and is decreasing. d. dp/dt is negative at the maximum and is increasing.

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