What is the role of the ryuteki and the hichiriki in Etenraku?

Time signatures trace back to the:

A) School of Notre Dame B) Ars antiqua C) Ars nova D) Ars subtilior

The instrument that was also known as the "slide trumpet" and is the ancestor of the modern trombone is:

A) psaltery B) racket C) sackbut D) shawm