Which of the Following Describes the Main Difference Between Observational

Which of the following describes the main difference between observational learning and operant conditioning?

A) Observational learning uses mainly punishment to condition behavior as compared to operant conditioning,which uses both reinforcement and punishment.
B) Observational learning uses mainly reinforcement to condition behavior as compared to operant conditioning,which uses both reinforcement and punishment.
C) Observational learning uses different schedules of punishment and reinforcement to condition behaviors as compared to operant conditioning.
D) Observational learning uses punishment and reinforcement of models to condition the behaviors of observers.