A vertical line to left of multiple staves indicate to a musician to play music on all staves at the same time.
Answer:
color discord
Explanation:
a color discord is another word for color wheel and as we all know, a color wheel brings the similarities (and differences) of different shades, types, and colors
( interrelationship: the similarities of group of something or someone )
I guess the answer is between A and D
Rojo
Naranja
Amarillo
Verde
Azul
Morado
