Can anyone explain how to arrive at the proper answer for this?

Thank you!

Question 15 The following side-by-side bar graph shows the level of post-secondary education achieved ten years after high school for graduates from the years 1999 and 2001. Use the bar graph to answer the question. 40 Percentage 10 2301 Ho colce: Some college Grodusted cullegs, Oradusted culegs AmockLe's demer Bachelor's degree In which category was there more variablity apparent? O No College ) Graduated College, Bachelor's Degree O Some College () Graduated College, Associate's Degree