Final answer:
A Sub-investigator and Co-investigator in clinical research assist in conducting the study, collect data, and ensure protocols are followed, without holding the primary responsibility for protocol development or decision-making authority in study design.The correct option is C.
Step-by-step explanation:
In clinical research, the roles of a Sub-investigator and Co-investigator typically involve assistance in conducting the research, collecting data, and ensuring protocol compliance. They work under the guidance of the principal investigator to facilitate the study, but they do not usually hold primary responsibility for protocol development nor do they have sole decision-making authority for study design. This assistance could involve a range of activities, such as coordinating patient schedules, maintaining detailed notes, ensuring proper documentation, and working closely with nurses, doctors, and the clinical trial coordinator to successfully carry out the trial. Their responsibilities are crucial for ensuring ethical standards and protocol adherence which are overseen by institutional review boards (IRBs).