Why Do Adult Gangs Use the Juvenile Gang Members to Commit

Why do adult gangs use the juvenile gang members to commit violent crimes?

A) because they don't drive and can't handle other responsibilities, such as errand running
B) because they need a responsibility since they are too young to carry weapons
C) because they need a responsibility since they are too young to deal in drugs at "rock houses"
D) because juveniles are likely to be treated less harsh than the adults in the criminal justice system