Which of the Following Is an Example of How Dulux

Which of the following is an example of how Dulux, a manufacturer of acrylic paints might use observational research?

A) Conduct a focus group of Dulux users to gain insights into the brand's current positioning.
B) Include a reply- paid mail survey with every unit of Dulux sold.
C) Watch how members of an adult education class use the product to paint mail boxes.
D) Ask users of another brand of paint to list the attributes that are most important in an acrylic paint product.
E) Survey existing customers to find out how the paint could be improved.