This can easily be answered by looking up their names or "the Watergate scandal" on Google. If you didn't have access to Google, however, you should know that the Watergate scandal involved former President Nixon spying on his political opponents at the Watergate hotel. Although this is not infallible logic, if you had to make an 'educated guess', Nixon was the president at the time. The president lives in Washington D.C, the US capital. This should lead you to believe that the Washington Post might have uncovered this scandal. Indeed those two reporters worked for the Washington Post.
Choice D is the true statement about ancient Egyptian history. Social mobility is not impossible because slaves that can read and write can become scribes, and therefore, can save up money for their families. They can move their way up by serving the government.
The answer is C. Is the assertion that consumer preferences determine the production of goods and services. Same answer.
I think the difference is caused by a person or group actually going through with genocide versus an attempt at it, but that's just my best guess?