Final answer:
The best organizational structure for the executive board of a test preparation company considering franchising would be decentralized.
Step-by-step explanation:
The best organizational structure for the executive board of a test preparation company considering franchising would be decentralized. With a decentralized structure, decision-making authority is distributed among different locations or units, allowing for more flexibility and adaptation to local markets. Franchising requires the ability to tailor operations to different locations, so a decentralized structure would be beneficial.