Answer:
The correct answer, that fills the gap is A. Sprechstimme.
Explanation:
Sprechgesang and Sprechstimme (German for "spoken song" and "spoken voice") are musical terms used to refer to a vocal technique that lies between singing and speaking.
This type of musical term was used in expressionism. The oldest known use of this technique was in the opera Königskinder by Engelbert Humperdinck (1897), but more frequently it is associated with the composers of the Second Viennese School, especially with Pierrot Lunaire, song cycle composed by Arnold Schönberg and released in 1912
