下面是一道
Read the following SAT test question, then click on a button to select your answer.
The bar graph above shows the number of employees at Company X for each of the years from 1996 through 2000. Over which of the following periods was the average rate of increase in the number of employees at Company X greatest?
A.From 1996 through 1998
B.From 1996 through 1999
C.From 1997 through 1999
D.From 1998 through 1999
E.From 1998 through 2000