If disclosure of a subject's involvement in a specific research study can be potentially
harmful to the subject, and the consent form is the only record linking the subject to the
research, which of the following would be most :
code the subjects' responses.
obtain a waiver of documentation of informed consent.
obtain a certificate of confidentiality.
have the subject sign the consent form under an assumed name

Obtain a waiver of documentation of informed consent.

Explanation:

According to Ethical standards and procedures for research with human subjects, All researchers need to notify the subjects in case the procedures that they are about to conduct can potentially create harmful effect to the subjects during and after the research.

To pursue such research, the researchers need to specifically explain the Dangers/Risks to the subjects and obtain a waiver of consent that the subjects sign willingly , without any coercion.

(Offering money as an incentives to subjects in such case is Allowed since it's not considered as coercion)

answer; the confederacy could afford to move a large number of prisoners hundreds of miles but could not afford to fee and house the prisoners;

answer; the civil right act of 1964;