It can be inferred that the author considers that from its many roots, country music became:
\begin{equation}\begin{array}{l}{\text { A. the most influential of all music genres. }} \\ {\text { B. a reflection of Appalachian mountain people. }} \\ {\text { c. best performed at the Grand Ole Opry. }} \\ {\text { D. representative of the American character. }}\end{array}\end{equation}