Which of these roles was NOT part of the Assembly of the League of Nations?

The Assembly of the League of Nations was primarily responsible for a range of functions that included approving the League's budget, choosing temporary members of the Council, and allowing new member countries. While the Assembly played a crucial role in these administrative and membership-related tasks, it was not designated to settle disputes between countries.

Dispute resolution was primarily the responsibility of the Council of the League of Nations. The Council had the authority to investigate disputes and recommend solutions or impose measures to maintain peace. Therefore, settling disputes was outside the purview of the Assembly, reinforcing that the correct answer is the option concerning dispute settlement, as only the Council had that authority.