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The graph above compares the number of problems completed on a math homework assignment by a student with the number of minutes after that student began working on the assignment. According to the data displayed in the graph, which of the following conclusions is best justified? (No calculator)


The longer that this student works, the more problems she is able to complete.


The rate at which this student is completing problems is gradually decreasing throughout the time in which the assignment was worked on.


There is a point in time after which the student seems to no longer be able to complete more problems.


About twice as many problems were completed after $40$ minutes as after $20$ minutes.

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