For Which Argument Below Are the Premises Independent

For which argument below are the premises independent?

A) Premises: I need income.Income requires a job.Conclusion: I need a job.
B) Premises: Learning a skill requires practice.Logic is a skill.Conclusion: Learning logic requires practice.
C) Premises: A standard billiards set has 15 balls.This set has only 13 balls.Conclusion: This billiards set is missing 2 balls.
D) Premises: The flu is spread by a virus.Washing your hands kills viruses.Conclusion: Washing your hands helps to prevent the spread of the flu.
E) Premises: A humidifier would help my congestion.A humidifier would be good for my wooden floors.Conclusion: I should buy a humidifier.