The two items that the Workshop Facilitator should be provided with when preparing for the workshop are:
*B. An understanding of the decision-making process. This will help the facilitator guide the discussion and help the group reach a consensus.
*C. Background to the disagreement and the reasons for this. This will help the facilitator understand the context of the disagreement and facilitate a more effective discussion.
Please note that while hints and tips on how to influence and persuade others (option A), empowerment to discuss any wider project issues that may arise during the workshop (option D), and a step-by-step guide to running an effective workshop (option E) could be helpful, they are not as crucial as understanding the decision-making process and the background to the disagreement for this specific workshop.