Answer:
The correct answer is A. A formal meeting of delegates and representatives.
Step-by-step explanation:
The different organizations have smaller units which send some members to a convention to deliberate about the main problems that a certain organization has and try to agree.
There are also political conventions, in which there are common problems such as the selection of a party candidate or a party president. There is an important aspect that many states have and it is the existence of provisions for the different conventions.
An example of this is the Constitution of the United States which makes uses of a provision when there is a constitutional convention. In this convention, states deputies meet to correct some aspects related to the constitution.