A Group of Consumers Is Given Various Types of Dishwasher

A group of consumers is given various types of dishwasher detergent and is asked to use the products for six months. During that time, the consumers are to record in a journal their level of satisfaction with each product, noting what they liked and/or disliked about each. This is an example of

A) scanner data.
B) focus data.
C) panel data.
D) target research.
E) observation research.