Final answer:
The organization that could support Philip, Amy, and Hugh in negotiating the labor dispute is the National Mediation Board. Option B is correct.
Step-by-step explanation:
If Philip, Amy, and Hugh needed additional help negotiating this labor dispute, the organization that could support them is the National Mediation Board (option b).
The National Mediation Board is an independent federal agency in the United States that helps resolve labor-management disputes in the transportation industry. It provides mediation, arbitration, and other dispute resolution services to assist parties in reaching agreements.
Other organizations listed in the options, such as the Federal Organization of Labor Unions (option a), Organization of Labor Professionals (option c), and National Union Guild (option d), do not have specific roles in labor dispute resolution like the National Mediation Board does.