David rosenhan argues that misdiagnosis is particularly a problem for psychologists, as a diagnosis of a mental illness is as influential on the patient as it is on her relatives and friends. it should not surprise anyone that the diagnosis acts as a(n):

B.

The David Rosenhan study

Explanation:

She is collecting data systematically.

Explanation:

Katie is using a questionaire based research tool to acrue important information about her audience.

The questionaire is filled with relevant questions, which are to be answered by the audience. Hence, given Katie a better insight on who are her audience.

After the questionaires are been answered by the audience, they are analysed using some statistical package or tool to mine the data into a clear information for easy digest.