A group of people united to promote a cause, such as the members of a party led by the Speaker, is called a caucus.
What is caucus?
A caucus is a gathering of members or supporters of a political party or movement. Different countries and political cultures have different definitions.
The phrase originated in the United States, where it can refer to a meeting of members of a political party in the United States Congress representative organs of government to select candidates, plan policies, and so on.
Thus, option A is correct.
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