Which material would have the largest contribution to Materials and Resources Credit, Building Product Disclosure...

In the context of LEED AP ID+C V4, for the Building Product Disclosure and Optimization - Sourcing of Raw Materials, Option 2: Leadership Extraction Practices, the contribution is calculated based on the cost of the product and the percentage of certification. The furniture option, despite having a lower percentage of certification, has the highest total cost, which results in the largest contribution by cost to the credit.

References: This approach is consistent with the LEED v4 guidelines for Interior Design and Construction, which prioritize the economic value of materials when calculating contributions to credits1. The Rainforest Alliance Certification is recognized as a leadership extraction practice, and the contribution is calculated based on the total cost of the product and the percentage of the product that is certified1.