Who recorded country's first million-selling record?

Vernon Dalhart sang and recorded "The Prisoner's Song," which became country music's first multi-million-selling record and helped launch the genre as a commercial force.This song was one of the best-selling songs during the 1920s and it had sold around 1.3 million records when the song reached its climax of popularity.

hello there are no statements below!

i believe the answer would be b. hope it : )