The primary purpose of the passage is to A. point out the parallel effects on jazz music of governmental actions in San Francisco and New Orleans B. offer an alternative to the standard explanation for the decline of San Francisco as a jazz center C. argue for the importance of Californian cities in the development of jazz D. present and refute an argument about the reasons for a demographic shift in jazz activity E. outline the factors that contributed to a change in the Geographical locus of jazz activity