To strengthen an argument that attributes a recent decline in sales to a new advertising campaign, which of the following would be most helpful to examine?

The correct answer to the question "To strengthen an argument that attributes a recent decline in sales to a new advertising campaign, which of the following would be most helpful to examine?" is Option A: Sales data from competing companies during the same period..

The other options — B) Employee satisfaction surveys before and after the campaign., C) The qualifications of the advertising agency hired., D) Customer feedback specifically regarding the previous advertising campaign. — are incorrect for this GRE Exam Prep question. As explained above: To strengthen the link between the new campaign and declining sales, one needs to rule out other possible causes. Examining competitor sales data would help determine if the decline was an industry-w…