Answer:
The most unique feature of “The Ninth” was that Beethoven included chorus and vocal soloists in the final movement. He was the first major composer to do this in a symphony.
Tessellation's definition is identical shapes which fit each other and leave no gaps in between. For example you could have a tessellation of triangles or a tessellation of squares or even hexagons.
I'd say America, hope this helped!
I think the first one is B and the second is C, sorry if im wrong.