Final answer:
The correct answer to fill in the blanks is a) Study purpose; withdraw; Consent withdrawal, as participants must be informed about the study's purpose and have the right to withdraw at any time.
Step-by-step explanation:
Participants must sign an informed consent form explaining the study purpose, assuring them of their rights to withdraw to participate. Withdraw from the study at any time. The correct answer is a) Study purpose; withdraw; Consent withdrawal.
Researchers must gain written consent from participants, which includes providing details on the study purpose, any potential risks, benefits, procedures involved, and the confidentiality of data. A principle of autonomy requires that participants enter into the study voluntarily and remain free to withdraw at any point without consequence.