Which statement describes the rate of change of the number of items the worker packed in boxes with respect to the number of minutes the worker has been packing items in boxes?

the worker packed 3 items in boxes per minute
the worker packed 8 items in boxes per minute
the worker packed 12 items in boxes per minute
the worker packed 16 items in boxes per minute

The statement "the worker packed 8 items in boxes per minute" describes the rate of change of the number of items the worker packed in boxes with respect to the number of minutes the worker has been packing items in boxes.