This question refers to the "Claims Processing" case. A hospital processes claims and the insurance companies often reject them for coding errors. A process improvement team has been working on a project to reduce coding errors for the past $15$ months and the data for the number and type of coding errors can be downloaded from the link provided. Use this data to answer the question below.

To improve, the team selected Codes C$,$ D$,$ and E$.$ Which of these shows an improvement over time?

A Codes C & E show improvement

B All three have improved

C C & D have improved

D Only C has gotten better

E D has improved

Exam