Question

the president - elect says these words at a special event called an inauguration ceremony. this event takes place in january after the election. at the inauguration, the president - elect officially takes over the job of president.
what does the president - elect promise to do at the inauguration ceremony?
follow his or her duties as the new president
pick a new vice president
keep all laws the same

Explanation:

The text says that at the inauguration, the president - elect officially takes over the job of president. So the president - elect promises to follow his or her duties as the new president. Picking a new vice - president is not part of what happens at the inauguration (vice - president is elected along with the president), and there's no mention of keeping all laws the same at the inauguration.

Answer:

A. follow his or her duties as the new president