Business communication has become more challenging than ever before, because of ( ). A: the increasingly flattened management style and emphasis on team work B: the pervasiveness of digital technology C: the globalization of business and the increase in workforce diversity

Business communication has become more challenging than ever before, because of A: the globalization of business and the increase in workforce diversity B: the increasingly flattened management style and emphasis on team work C: the pervasiveness of digital technology D: all of the above