The graph below shows the relationship between two variables.

Which scenario is BEST represented by the graph?

David drove at a constant speed before slowing down in a school zone. He then increased the speed of his car.

The number of perfect test scores by students in a math class increased from the first to the second grading period and then began to decline.

After a period of slow growth, the height of a plant remained the same for 2 weeks. It was then fertilized and began to rapidly increase in height.

The number of employees at a store increased at a constant rate for 5 years. There was a decrease in the number of employees for 2 years. Then the number of employees increased at a greater constant rate for the next few years.