Hi Kelly.
As you noted Acceptance criteria can be documented in the project charter, the scope document and the requirements document. I would add it can also be documented in the Traceability Matrix and the WBS Dictionary.
As you already know, projects are progressively elaborated and Acceptance Criteria are no exception. high level acceptance criteria could be identified at the project initiation phase and would be documented in the project charter. as the project progresses our understanding of the project and its acceptance criteria increases and so more detailed and accurate Acceptance criteria would be documented as we progress through the project.
So I would say the correct answer would depend on the situation described in the questions and in which stage the project is currently standing. In the question you have attached, the project is delivering the final phase, at this stage you would definitely refer to the detailed acceptance criteria in the Scope document rather than the high level ones in the charter.
hope this clears the confusion.