When His Mother Left Him Alone in a Room with a Stranger

When his mother left him alone in a room with a stranger, one year-old Carlos was very upset and cried for a long time. When she returned, Carlos clung to his mother and cried some more. Research findings in the attachment field suggest that Carlos: ____________________________.

A) probably experienced a major traumatic event in infancy, such as being in a car accident.
B) probably has a difficult temperament.
C) has probably been exposed to unresponsive parenting.
D) acted like a typical one-year-old infant.