A sounds ok to me...
Even if the advertising revenue has increased, we need to find out the ratio of the advertising revenue to that of total revenue....
Wht if the advertising revenue has not kept pace with the toal revenue, in that case the reorganisation has no effect..

Not an easy one! I'll go with A.
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Hard work is the main determinant of success

OA is B.

The OE:

The reasoning: What additional evidence would help determine the source of the increased revenue? In order to attribute to the reorganization of the sales force, other possible causes must be eliminated. (I was headed this direction though). Newspapers advertising rates are linked to circulation; when circulation increases, higher rates can be charged and revenues will increase. (I though prior knowledge is NOT required in GMAT???) An alternative explanation might be a significant rise in circulation, so it would be particularly helpful to know if circulation had increased.

B: Correct. This statement provides another possible explanation for increased revenue of advertising sales, and so the answer to this question would help to clarifiy the reason for the increased revenue.

IMO B. If correct then will give the reasoning

IMO D (very tough choice as no clear answers).

Reasoning as follows: The intention of reorganization was to have SR focus on only one clients. Earlier, due to a geographical focus, a comprehensive relationship with a single client might not have developed. However, after the reorganization a better relationship with the client might have developed probably leading to greater standing orders per month.

As I said, this is not a very clear-cut choice, but in my very humble opinion the "best" answer choice.

If you guys could explain why you chose B it would be great.

Also, the OA/OE would be awesome !

D sounds best among given choices.

Good CR question, straigth D.
B cant be answer, reason argument says that revenue from sales ad has been increased, but dont say anything about the circulation.

I think is B. If the circulation increased, it is not sure that the financial performance was a result of the reorganization. I think that D is irrelevant since we don't know nothing about the relation between standing orders and reorganization.

Premise1: GT ad sales declining for several years.
Premise2: GT reorganized sales team.
Premise3: Before reorganization, Sales team was georaphy based.
Premise4: After reorganization, sales team focus either on one type of industry or on one type of retailing.
Premise5: GT ad sales increased after organization.

Rephrased question: Did sales increase due to reorgnization or some other reason?

(A) What proportion of the total revenue of Greenville Times is generated by advertising sales?
Does not explain sales increased due to reorganization or for some other reason.

(B) Has the circulation of the Greenville Times increased substantially in the last two years?
Question is concerned about ad sales revenue and not about revenue from circulation, so this is irrelevant.

(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?
Does not explain sales increased due to reorganization or for some other reason.

(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?
It does explain the fact. If answer to D is yes, then ad sales increased due to standing order and not because of sales team reorganization, however, if answer to D is no, then sales team reorganization did work.

(E) Among the advertisers in the Greenville Times, are there more types of retail business or more types of industrial business?
Does not explain sales increased due to reorganization or for some other reason.