Answer:
c. Designing the survey so that subjects are not forced to answer one question before going to the next.
Explanation:
A researcher while conducting specific research asks the participants which he or she has been chosen for the purposed of research to sign the informed consent in which the researcher has mention the terms and conditions and brief description about a particular study.
In an informed consent, a researcher should mention that the participant's information will be kept confidential and hence they can withdraw from the research whenever they want. They have the liability of answering questions and skipping them if they want to. In short, the researcher should follow the ethical guidelines.