The answer is D. Walls, floor and ceiling.
Answer:
The term is harmony.
Explanation:
The word harmony is used to refer to and order arrangement of voice parts. It can also refer (musically) to the simultaneous mixture of tones, or sounds (especially when blended into musical chord) such that it is pleasing to the ear;
When used as a cooperative expression, it means working together towards a common goal or having congruous relationship with other people.
Cheers!
A thread or filament from which a vegetable tissue, mineral substance, or textile is formed
