I believe the answer would be D (all of the above).
Richard Nixon was the 37th president of the United States from 1969 to 1974. He is the only US president in history to have resigned from office. This was due to the Watergate Scandal, which was the release of tapes that involved the Nixon Administration incurring in unethical acts in order to gain political advantage over the Democrats. These practices included the use of espionage tactics and harassment over opposing political figures. As a response to an imminent impeachment and removal from office, President Nixon decided to resign.
The military facility that was built in Oak Ridge, TN in 1942 was created as the production site for the Manhattan Project. The Manhattan Project was an American, British, and Canadian project that developed the first atomic bomb.
D. developing materials to be used in the creation of the atomic bomb
