Question

in the united states, this travel organization is the main body for the promotion and development of tourism because there is not a specific government body responsible for these tasks.
the travel industry of america
the national tourism organization
the organization for economic cooperation and development
the association of convention and visitors bureaus

Explanation:

The Travel Industry of America is a key non - governmental entity for tourism promotion and development in the US as there's no specific government body for such tasks. The National Tourism Organization is more of a general term and not the main one in the US context here. The Organization for Economic Cooperation and Development is an international economic organization, not focused on US tourism. The Association of Convention and Visitors Bureaus is more local - level in promoting specific destinations like cities, not the main body for overall US tourism promotion and development.

Answer:

The Travel Industry of America