When voters turned down the school budget in a May vote

When voters turned down the school budget in a May vote, the administration scrambled to prepare a second budget. The president of the school board insisted that new budget contain fewer administrative positions, as she posited that people had voted "no" due to dislike of a top-heavy administration.

Which of these investigations would be most useful in evaluating the board president's claim?

(A) Comparing the number of administrators to the number in other districts

(B) Adding up the salaries and benefits for all district administrators

(C) Graphing five years of correlation between numbers of students and administrators

(D) Surveying neighborhood districts to determine which budgets passed

(E) Exit-polling voters to determine the reasons for their votes

(McGraw-Hill)