Answer:
confidentiality
Explanation:
Confidentiality is a term used in research to describes the situation in which the researcher knows the identity of a research participants, but takes steps to protect that identity from being discovered by the readers. Thus, the principle of confidentiality in a research states that, each subjects participants identity is protected, most especially, when it comes to research of personal information such as research on Sexual topic or Illegal Drug Use among subjects participants.
Hence, in this case, maintaining confidentiality is a key measure to ensure the protection of private information.
However, when Susan, the researcher, is having each subject identified by his or her Social Security number. Susan in this case is most likely to be in jeopardy for violating the principle of CONFIDENTIALITY, as social security number is a sure means to identify each individual or subject participants involved.