Jennifer is taking a speed reading course. She records m(t), the most number of words that she can read in a minute (wpm), after t weeks of beginning the course.
t] 1 2 3 4 5 6
m(t)]124 160 220 304 412 544
According to the table, what is the average rate of change over the interval [1, 4]?
A. 60 wpm per week
B. 180 wpm per week
C. 144 wpm per week
D. 48 wpm per week