You have been asked to write an essay about the checks and balances of political power in the United States federal government. Which of these is the most effective topic sentence for a paragraph in this essay? A. One of the branches of the United States government is the executive branch.

B. The federal government is sometimes called other things, like the "national government" or "Washington."

C. This essay is about the checks and balances of political power in the United States federal government.

D. The judicial branch has the following check over the legislative branch: courts can judge legislative acts to be unconstitutional.