Based on the information provided in the table, the most accurate answer to how the governments of Canada and the United States differ is:
C. The executive branch is more independent in Canada than in the United States.
This answer reflects the differences in the roles of the heads of government. In the United States, the president is both the head of state and head of government, while in Canada, the prime minister (head of government) operates alongside a monarch as the head of state, indicating a difference in the structure and independence of the executive branches.