What is one of the main goals of the Democratic and Republican conventions? A. to introduce the candidate's credentials and experience
B. to introduce to the public the party leaders
c. to disparage the other party's candidate and platform
D. to publicly define and adopt the party's platform

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explanation:

they bring people together to achieve control of the government

basically choosinng what sets in   congress and presdicny this is to keepthe antion hole and so it can last because wiht out authority it wouldnt last a week