Traditionally, the first primaries are held: A. By the Democratic Party
B. In New Hampshire
C. Nationwide at the same time
D. In alphabetical order by state

A. By the Democratic Party

Explanation:

The 1968 Democratic presidential primaries were the selection process by which voters of several states elected delegates to the 1968 Democratic National Convention. Incumbent Vice President Hubert Humphrey was selected as the nominee in the 1968 Democratic National Convention held from August 26 to August 29, 1968, in Chicago, Illinois. (an exerpt from wikipedia)

i believe the answer is:   psychological  experiment

in this experiment, wilhelm wundt became the first person that implement scientific method in analyzing the pyschological phenomenon.

due to this result, wilhelm wundt also able to make psychology to be acknowledged as a separate scientific field from biology.

the answer is       political office  

hope this .