Which of the Following Is an Example of the Communication

Which of the following is an example of the communication method of obtaining data?

A) The researcher classifies people into social class strata by personally rating the furniture in their homes via on- site visits.
B) A researcher infers people's reactions to a product display by noting how long they stand in front of it.
C) A researcher assesses the popularity of various museum exhibits by noting tile wear in front of each exhibit.
D) A researcher measures consumer attitudes by means of subjects' responses to a questionnaire.
E) A researcher notes the gender and race of each person making a purchase during a special sale.