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.
A is the correct answer, as noted.
Samuel Adams was the leader of the Boston based Sons of Liberty and worked to lead protests against British taxation of the colonies after the 7-Years War.
One of those protests was the Boston Tea Party.
Even several decades before the fall of Constantinople to the Ottoman Empire in 1453, most of Greece had come under Ottoman rule. During this time, there were several revolt attempts by Greeks to gain independence from Ottoman control
The oath was administered by Robert R. Livingston.
Hope this helps.