Answer:
This is quoted from Tadziu Johnson's quora account. All credit goes to him. "MCs are people who get the crowd moving, who entice the audience; whereas rappers are interested in the poetry (as it pertains to being iterated) only."
Explanation:
It would say that the technique that was discontinued during the swing era was Collective improvisation (option B) This might be because improvisation was connected to Jazz and Free Jazz music. Swing jazz is based on the off-beat or music pulse.
