During the 1990s many Australians called for their nation to become a republic with ________.【单选题】

During the 1990s many Australians called for their nation to become a republic with ________.

A. a president replacing the British monarch as head of state

B. a prime minister replacing the governor--general as head of government

C. a governor-general replacing the British monarch as head of state

D. a president replacing the governor- general as head of government