The best answer is B.

Under ISO 45001, worker consultation and participation is required by Clause 5.4, but the standard does not require a specific documented procedure for that clause. The organization must provide mechanisms, information, time, training, and resources for consultation and participation, but ISO 45001 does not say it must maintain a formal procedure specifically for this.

Also, ISO 45001 Clause 7.5.3 requires documented information to be controlled so that it is available and suitable for use, and adequately protected. An “obsolete” document is not automatically a nonconformity just because it exists. It may be retained for reference or historical reasons, provided the organization controls it properly and it is not being used unintentionally as current information. That is why the correct audit reaction is to note it and verify on site whether it is actually part of the current controlled documented information.

Why the other options are not the best:

A is weak because using an obsolete procedure to prepare the checklist risks relying on invalid information before confirming what the current controlled version is.

C is unnecessary as the first response. You already have enough evidence to note a potential document-control point and verify it during the audit.

D is incorrect because you should not raise a nonconformity before verifying the facts on site. An obsolete-marked document alone does not prove a breach of Clause 7.5.3. A nonconformity must be based on objective evidence gathered during the audit.