What term or topic is best associated with parallel organum?

Which one of the following is not true about HD Radio?

a. It’s a roaring success in the marketplace. b. It’s a digital medium. c. It allows a single radio station to squeeze in more channels. d. It was slow to gain traction with consumers.

Sprechstimme is

A. the term Schoenberg preferred to atonality. B. an opera composed by Schoenberg. C. the German term for Impressionism. D. a vocal technique using expressive glides from one inexact note to another.