Answer:
Whether people held as slaves would be counted in the census for the purpose of representation.
Explanation:
The official framework of Constitution of the United States was instituted on June 21, 1788. The ratification of the Constitution left unanswered some questions.
The questions that were left unanswered includes the unity of the nation, tolerance of slavery even though the Constitution insituted 'all men to be equal.'
The question that was left unanswered was that whether should slaves be counted in the census or not as representatives.
Thus the correct option is the third one.