What is one of the information requirements for informed consent?

Voluntariness is a critical component of informed consent in research and clinical settings. It ensures that individuals have the freedom to make their own decisions regarding participation in a study without any coercion or undue influence. This aspect of informed consent highlights the importance of allowing participants to choose whether or not to join the research based on their own values, beliefs, and circumstances. Voluntariness protects individuals from feeling obligated to participate due to pressure from researchers or external factors, thereby promoting ethical standards in research practices.

Other options do not relate directly to the core principles of informed consent. Mandatory participation in social activities does not pertain to the decision-making process regarding research consent. Pre-approval of external vendors is a logistical issue and not part of informed consent requirements. Confidentiality clauses are essential in the context of protecting personal information but do not directly relate to the initial requirement of ensuring that participation is voluntary.