OG13DT逻辑22

Following several years of declining advertising sales, the Greenville Times reorganized its advertising sales force. Before reorganization, the sales force was organized geographically, with some sales representatives concentrating on citv-center businesses and others concentrating on different outlying regions. The reorganization attempted to increase the sales representatives' knowledge of clients' businesses by having each sales representative deal with only one type of industry or of retailing. After the reorganization, revenue from advertising sales increased. 　　In assessing whether the improvement in advertising sales can properly be attributed to the reorganization, it would be most helpful to find out which of the following?

A.What proportion of the total revenue of the Greenville Times is generated by advertising sales?
B. Has the circulation of the Greenville Times increased substantially in the last two years?
C.Among all the types of industry and retailing that use the Greenville Times as an advertising vehicle, which type accounts for the largest proportion of the newspaper's advertising sales?
D.Do any clients of the sales representatives of the Greenville Times have a standing order with the Times for a fixed amount of advertising per month?
E. Among the advertisers in the Greenville Times, are there more types of retail business or more types of industrial business?

我对题目的理解在广告上收入的上升时由于这样的reorganization?
OG的解释 B 流通增加 higher rates can be charged and revenue will increase.这里的HIGH RATES是什么。
我对这个选项的原本理解是流通增加，杂志的销售量也上升了，所以REVENUE也增加了，但是仔细一看说得是在广告上的REVENUE上升，感觉和总的流通量关系不大，请大神帮我讲个明白