Which of the Following Ways of Investigating Political Communication Is

Which of the following ways of investigating political communication is an example of ethnographic research?

A) Volunteer to work in the campaign of a senate candidate and observe his/her behavior.
B) View videotapes of campaign ads and identify the themes used at various stages of the campaign.
C) Interview a representative group of politicians, asking them to describe and rate strategies used in the campaign.
D) Create two different ads, one that attacks a candidate's opponent and the other than gives positive information about the candidate; show the ads to randomly selected groups of viewers to see which is most effective.