Which of the following is characteristic of New Orleans Rock 'n' Roll? A. Close harmony backing vocals
B. Staccato backbeat emphasis on the steel guilar
C. Harmonica as a solo instrument
D. An overall bass foundation

New Orleans rhythm and blues can be characterized by predominant piano, "singing" horns, and call-and-response elements. Clear influences of Kansas City Swing bands can be heard through the extensive use of trumpet and saxophone solos.

Explanation:

d) a constitutional amendment

explanation:

an oligopoly is a term used to clarify the structure of a particular market, industry, or organization. a market is considered oligopolistic or amazingly focused when it is shared between a few companies.