Answer:
Primary
Observation.
Step-by-step explanation:
Primary data refers to the data that is obtained by the researcher himself/herself , while secondary data refers to data obtained by other person who is not the researcher and that the researcher will use for its investigation.
Observation method, as its name states, refers to observing the behavior needed for the research without actually attempt to change it and without making any experiments.
In this case, Carmen will go to happy hour and she herself will observe individuals and what type of alcoholic beverages they order, how often, etc. Therefore, the data that she will obtain is primary data (she will obtain her herself) and she will use observation in its collection.