Cox Radio, one of the nation's largest radio chains, plans to ______ its ties with independent record promoters to distance itself from a payola-like practice that runs rampant in the music business.

A．genocide
B．immigration
C．discrimination
D．election

A．drawing an analogy between asymmetry in lobsters and handedness in humans
B．developing a method for predicating whether crusher claws in lobster will appear on the left or right side
C．explaining differences between lobsters' crusher claws and cutter claws
D．discussing a possible explanation for the way bilateral asymmetry is determined in lobsters