Answer:
B
Explanation:
Grogged clay has LOW plasticity.
a- it reduces warping
c - it helps increase stability/strength
d- it reduces shrinkage
A vertical line to left of multiple staves indicate to a musician to play music on all staves at the same time.
I may be wrong but I would say the sound production team. Hope this helps ;)
Soul Music? because the popularity on there hit songs was the first