What is an example of observational learning?

What is an example of observational learning?
  a. A baby garter snake captures and eats a slug.
  b. A chicks gaping mouth induces a feeding response in a parent bird.
  c. A European cuckoo hatchling pushes the host bird's egg out of the nest.
  d. A male fruit fly waves his wings at a female fruit fly during courtship.
  e. A marmoset monkey mimicking another marmoset in successfully opening a container.

Question 2

Imprinting is a form of ____.
  a. innate response
  b. static pattern
  c. instinctive behavior
  d. unlearned behavior
  e. passive behavior