The Following Passages Contain Novel Information Describing Real Animal and Human

The following passages contain novel information describing real animal and human behaviours. Use the choices to classify the type of learning exemplified by each passage. A learning type may be used once, more than once, or not at all.
-A group of ducklings were experimentally isolated in a room containing only a large cardboard box that researchers rigged to be movable by remote control. The ducklings soon became attached to the box, following it around the enclosure.

A) imprinting
B) classical conditioning
C) operant conditioning
D) insight learning
E) habituation