It can be inferred that the author regards the independence from social class of the heroes and heroines of nineteenth- century opera as______ .
A.
an idealized but fundamentally accurate portrayal of bourgeois life
B.
a plot convention with no real connection to political reality
C.
a plot refinement unique to Verdi
D.
a symbolic representation of the position of the bourgeoisie relative to the aristocracy and the proletariat