6. Which of the following terms describes the president's refusal to reveal confidential materials based of the belief that it could interfere with their ability to
govern?
Appropriation
Subpoena
Authorization bill
Executive privilege

Executive privilege .

Explanation:

The Executive privilege  is the privilege bestowed upon the president or a high executive officer to conceal confidential materials and information from the courts, Congress and public.It is based on the belief that revealing such information may interfere with the ability to  govern. Therefore, executive privilege is used to withhold information for the purpose of national security and public interest.Thus, executive privilege describes the president's refusal to reveal confidential materials based of the belief that it could interfere with their ability to  govern.