Which of the these was a precedent set by the first president of the united states, george washington? a) the popular election of the president b) the tradition of only serving two terms c) naming nine justices to the supreme court d) addressing the chief executive as as "your highness"

The correct answer should be b) the tradition of only serving two terms

Although it wasn't an official law, it became something that all other presidents after him followed, up until Roosevelt who had more terms due to WW2. After Roosevelt, the number of 2 was made official using amendments to the constitution.