The cost, c(x), for a taxi ride is given by c(x) = 2x + 4.00, where x is the
number of minutes. What does the slope mean for this situation?

A. The rate of change of the cost of the taxi ride is $4.00 per minute.

B. The taxi ride costs a total of $4.00.

C. The taxi ride costs $2.00 per trip.

D. The rate of change of the cost of the taxi ride is $2.00 per minute.