What Might Stepped-Up Efforts to Curb Drug Dealing in One

What might stepped-up efforts to curb drug dealing in one area encourage?

A) the increased use of violence by drug dealers to protect their territory
B) a displacement effect, where drug dealers seek out friendlier "business" territories
C) increased drug use because the more resistance to a behaviour, the more people will do it
D) less drug use because the police are visible, and the community is oriented again