Which idea has not been seriously suggested as the unplayed "principal" theme of Elgar's "Enigma" Variations?

Matthias Grünewald was a Northern Renaissance painter who created the Isenheim Altarpiece (fig. 18.36)

Indicate whether the statement is true or false

Our text states that in country music from the 1960s to 2000s, the central tension in country music is

between:

a. identity and commercial success b. words and rhythms c. traditional instruments and modern form d. commercial success and artist exposure