In March of 1908, Board, Armstrong & Company Opened a Plant

In March of 1908, Board, Armstrong & Company opened a plant in Alexandria, Virginia to make apple cider vinegar. It decided to call its use the brand name White House because it was located across the river from the Presidential mansion. In 1913, it changed its name to National Fruit Product Company, and that is its name today. In 1999, the company conducted focus groups of young mothers in North Carolina and Florida to determine it label improvements would allow it to more effectively market its apple juice.
-When the marketing researchers verified the new White House labels were designed according to the recommendations they made as a result of their research, they would be conducting a:

A) research follow-up.
B) market test.
C) concept test.
D) goal diagnosis.
E) research sampling.