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.
-The primary advantage associated with the use of focus groups is:

A) the rapidity with which it is conducted.
B) the ease with which structured interviews can be conducted.
C) the ability to use convenience samples.
D) the interaction of the participants.
E) none of the above.