Given the histogram, the x-axis represents the years employees worked for the Department of Defense, and the y-axis represents the frequencies. What percentage of those surveyed worked longer than 30 years? (Note the lower and upper limit for the first class is 0, 9 respectively.)

Group of answer choices

A. 17%

B. 24%

C. 28%

D. 87%

E. None of the above are correct.