Which of the following is the least important activity when protecting human subjects in international research?

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Protecting participants hinges on three core safeguards: ensuring that people understand and voluntarily agree to participate (informed consent), having an ethical review by a local body to evaluate risks and proper conduct (local IRB review), and protecting people’s privacy by keeping their data confidential. These directly address participants’ rights, safety, and privacy. Assessing transportation conditions is mainly a logistical and safety consideration for researchers and study operations rather than a direct mechanism that protects a participant’s rights or privacy. While good transport safety matters for overall well-being, it doesn’t establish consent, ethical oversight, or data protection in the same fundamental way. Therefore, evaluating transportation conditions is the least central activity to protecting human subjects in international research.