The responsibilities of the State Department include : a. formulating defense policy. b. appointing the Secretary of State. c. directly overseeing U. S. intelligence agencies. d. staffing U. S. embassies and consulates worldwide. e. overseeing U. S. military operations.

d. staffing U.S. embassies and consulates worldwide.

Explanation:

The United States Department of State is the country's first line in foreign affairs and relations. They engage in actions geared at protecting and advancing American interests around the world as well as actions that contribute to the general well being of the world, all of which are in line with the President's foreign policy.

As the first line of communication with foreign entities, the Department of State maintains and staffs over 250 U.S. embassies and consulates worldwide which communicate with not only countries, but with international organisations as well.  

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