What is the judicial branch's primary role in the system of checks and balances?
A. to determine the constitutionality of the acts of the other two branches
B. to oversee impeachment trials for high-ranking governmental officials
C. to establish original jurisdiction over international treaties
D. to oversee the function of lower federal courts

A. to determine the constitutionality of the acts of the other two branches

Explanation:

in february 1787, congress decided that a convention should be convened to revise the articles of confederation, the nation’s first constitution. in may, 55 delegates came to philadelphia, and the constitutional convention began. debates erupted over representation in congress, over slavery, and over the new executive branch. the debates continued through four hot and muggy months. but eventually the delegates reached compromises, and on september 17, they produced the u.s. constitution, replacing the articles with the governing document that has functioned effectively for more than 200 years.