Which of the Following Is an Example of Rate of Progress

Multiple Choice

Which of the following is an example of rate of progress?

A) Tom correctly answered 6 out of 12 math calculation problems.
B) Tom increased his math calculation skills by 2 problems per week.
C) Tom can complete 3 math problems correctly in a 1-minute period.
D) Tom completes 50% less problems in the same amount of time as his classmates.