What is the paradox concerning independent behavior in infants?

a. It appears to happen in boys whose mothers are unresponsive.
b. It appears to only occur in infants who are insecure resistant rather than securely attached.
c. It appears to require another person acting as a secure base for an infant to feel confident about acting indepenently and exploring the world.
d. The independence of infancy comes before the extremely high desire for dependence on parents seen in the teenage years.

c