What is the duty of the lieutenant governor in the state government?

The duty of the lieutenant governor in the state government primarily involves supporting the governor and stepping in to fulfill the governor's responsibilities when they are unable to do so. This role acts as a crucial part of the executive branch, ensuring continuity in leadership. The lieutenant governor may also have specific tasks assigned, such as presiding over the state Senate or taking part in various state activities and initiatives, depending on the state’s constitution and laws.

In contrast, the other choices do not accurately capture the role of the lieutenant governor. Serving as chief justice pertains to the judiciary, which is a distinct branch of government, while managing state law enforcement and overseeing economic affairs are typically responsibilities assigned to other state officials, such as the attorney general or treasurer. Therefore, the correct choice reflects the essential supportive and supervisory function of the lieutenant governor within the structure of state government.