Final answer:
The role of the attorney general established by the Judiciary Act of 1789 was to represent and prosecute all cases in which the federal government was a party.
Step-by-step explanation:
The role of the attorney general established by the Judiciary Act of 1789 was C) to represent and prosecute all cases in the United States in which the federal government was a party. The attorney general is the highest-ranking legal officer in the federal government and is responsible for representing the government's interests in legal matters. They also provide legal advice to the president and executive agencies.