challenge: What is the purpose of Greggs and McNulty's plan for Bubbles?
  
  A. To install a wiretap on the Barksdales' main phone line
  B. To force Bodie's crew to phone in for a resupply of drugs
  C. To gather intelligence on the Barksdales' financial transactions
  D. To gather evidence for a raid on the Barksdales' headquarters
  Answer: 