The most probable meaning of the word "opulence" (Line 9, Para. 1 )may be ______.

A．they are all Italian cities
B．they are all located by important routes
C．they are all prosperous with commerce
D．they are all located by seaside

A．was an important element in building the Renaissance culture
B．kept the people in cities alive with food and clothes
C．brought about the exchange of ideas
D．was always prosperous between city states