The IIA recognizes that internal auditors can provide valuable consulting services that support the organization's risk management without compromising their independence. Facilitating risk assessment workshops (option B) is a consulting service that internal auditors can perform, which helps the organization identify and evaluate risks in a structured way. This activity does not involve making management decisions or assuming management responsibilities, preserving the internal audit's advisory role.
IIA Standard 1000: "Consulting Services"

The greatest benefit of using forensic auditing techniques when fraud is discovered in an organization ' s procurement process is achieving a greater understanding of fraud through better evidence collection.
Forensic auditing techniques are specialized procedures designed to collect, analyze, and evaluate evidence in a way that meets the standards of a legal process, which is crucial for understanding the mechanisms of fraud and potentially pursuing legal actions.References: Forensic auditing practices and literature on fraud investigation techniques.

When the internal audit activity does not have the appropriate skills to review the organization's compliance with recently introduced legislation on international transfer pricing, the most appropriate course of action is to outsource the engagement to an external audit firm that has the necessary expertise. This ensures that the review is conducted thoroughly and accurately by professionals with specialized knowledge, maintaining the quality and reliability of the audit work while addressing the specific requirements of the engagement.
The IIA's International Standards for the Professional Practice of Internal Auditing (Standards) - Standard
1210: Proficiency.
The IIA's Practice Guide on Coordinating Internal and External Audit Activities.

If a CAE has no direct access to the board, the most appropriate action, according to IIA guidance, is to maintain communication with the board through written communications. This method ensures that the board is informed of relevant audit findings and issues, upholding the governance role of the internal audit function even without direct access. This approach aligns with IIA standards on communicating and reporting to senior management and the board.
The Institute of Internal Auditors (IIA) - International Standards for the Professional Practice of Internal Auditing, specifically standards related to communication and reporting.

ISO 31000 outlines risk management principles and guidelines, including the consideration of external context in the risk management process. The external context refers to the environment in which the organization operates. This includes, but is not limited to, cultural, social, political, legal, regulatory, financial, technological, economic, and competitive environments, both international and national. Therefore, option C, "The regulatory and competitive environment," is part of the external context for risk management according to ISO 31000.
ISO 31000:2018, Risk management - Guidelines