The function of a primary election is to

The purpose of a primary election is to narrow the field of candidates before a general election. Primary elections allow the people to play a larger role in the nominations of the party. The two main types of primary elections in the United States are open and closed elections.

Explanation:

the graph shows the spread of railways in the 1800s.

based on the graph, the conclusion that can be drawn about germany is answer d)   by 1880, germany had more rail lines than great britain and russia.

the right answer for the question that is being asked and shown above is that: "their policy of "divide and rule" pitted political groups against each other to keep any one group from becoming too powerful.  " the  participant in european imperialism is being described below is that  their policy of "divide and rule" pitted political groups against each other to keep any one group from becoming too powerful.