When Names Are Removed from Questionnaires and Are Replaced with Identification

Multiple Choice

When names are removed from questionnaires and are replaced with identification numbers so that only the researcher can later link a response to a name, the researcher should tell the respondent that the information is​

A) ​anonymous.
B) ​confidential.
C) ​anonymous and confidential.
D) ​harmless.
E) ​none of the above.