Answer:
A. Avoiding the collection of any identifying information.
Explanation:
Confidentiality: In research, the term confidentiality is described as the process through which an experimenter or the researcher makes sure that the information related to participants involved in particular research would be secured and locked-up. The researcher will not disclose a particular participant's information to someone else unless the participant himself or herself has permitted them to do so.
In order to maintain the confidentiality of the participant's involvement in the study or research, the researcher should avoid collecting identifying information of the participants including name, age, etc.
