In accordance with the CFR and the ICH GCP Guideline, which of the following is...

Theinvestigatorbears direct responsibility for ensuring IRB/IEC review and approval before initiating a study or implementing any amendments.

ICH E6(R2) 4.4.1:“Before initiating a trial, the investigator/institution should have written and dated approval/favorable opinion from the IRB/IEC for the trial protocol, written informed consent form, and any other written information to be provided to subjects.”

21 CFR 312.66:“An investigator shall assure that an IRB that complies with the requirements… will be responsible for the initial and continuing review and approval of the proposed clinical study.”

While sponsors may provide protocol documents, the legal obligation to submit and maintain IRB/IEC approval rests with the investigator at each site. CROs act under sponsor delegation but cannot replace investigator accountability.

Thus, the correct answer isB (The investigator).