Answer:
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:
Benjamin Zander's main goal in this video, The Transformative Power of Classical Music, is to show how much impact a piece of music can have on the mind. He makes the point that music is just frequency.
All of the choices given were invented before 1840 except for the zipper. The zipper was invented in 189. The correct answer is B.