What Did Albert Bandura Teach Us About Modelling, or Observational

What did Albert Bandura teach us about modelling, or observational learning?

A) Learning acquired through observation is much more resistant to extinction than behaviour acquired through classical or operant conditioning.
B) Much of our learned behaviour depends upon our interactions with those around us.
C) Our learned behaviour has much more to do with the types of consequences (reinforcements and punishments) of our actions than our interactions with those around us.
D) It is impossible to learn behavioural patterns without observing those around us.