Final answer:
The concern over safeguards of individual rights and liberties was not a reason for the calling of the Constitutional Convention of 1787; this concern emerged during the Constitution's ratification, leading to the creation of the Bill of Rights.
Step-by-step explanation:
The concerns about the Articles of Confederation that led to the calling of the Constitutional Convention of 1787 included a variety of issues such as the need for a stronger central government that could levy taxes, regulate interstate trade, and provide a standing military force. However, dissatisfaction over safeguards of individual rights and liberties was not a concern that led to the convention; rather, it emerged as a key issue during the ratification debates following the drafting of the Constitution. One of the main critiques of the newly proposed Constitution was that it did not include a Bill of Rights to protect such liberties, a concern which was addressed with the addition of the first ten amendments after ratification.
Therefore, the correct answer is A. Dissatisfaction over safeguards of individual rights and liberties, as this was not a concern that led to the calling of the Constitutional Convention, but rather an issue that arose afterwards and was remedied with the Bill of Rights.