Which of the Following Is Accurate in the Context of Sales

Which of the following is accurate in the context of sales and advertising? 

A)  Agencies that implement focus groups tend to do more quantitative and statistical research than their more traditional counterparts. 
B)  Creative cost is less than that of relying on secondary sources. 
C)  Account planners are being appointed with finance managers to work on each client's business.  
D)  To some advertisers, the gold standard is determining whether the ad actually gets people to do something, such as buy the product.