What Do John Porter's Analysis in the 1950s and 1960s

What do John Porter's analysis in the 1950s and 1960s and Wallace Clement's studies in the 1970s emphasize?

A) The concentration of ownership among large-scale enterprises
B) The significance of the transition from an industrial to a post-industrial economy
C) The long-lasting impacts of international monetary policies stemming from World War II
D) The relationship between economic and the military elites
E) The role of the State in creating an economic environment conducive to industry