Which of the following best describes a definition of a caucus?

A caucus is best described as a meeting to elect a party's presidential nominee. This definition highlights the primary function of caucuses in the political process, especially during the presidential election cycle. In a caucus, party members come together to discuss and express their preferences for candidates, leading to the selection of delegates who will represent their choice at later stages of the electoral process, such as conventions.

While political discussions around policies and the gathering of elected officials may occur in other contexts, the defining characteristic of a caucus is its role in the nomination process. This distinguishes it from social events, which do not serve a political purpose, and gathering focused solely on policy discussions, which might not involve the election of candidates directly.