Otis is a youthful elephant who was taught to use his trunk to offer flowers to people. However, as Otis grows older he eats the flowers at least half the time. This situation can be best explained by:

instinctive drift.

Explanation:

Instinctive drift refers to an animal's tendency to return to instinctive behaviors that are in conflict with a conditioned response. The animal no longer practices the behaviors that have already been taught but returns to behaviors which are in accordance to their nature. The idea sprang from the two students of B.F. Skinner named Keller Breland and Marian Breland, tried to teach raccoon to place tokens in a piggy bank but the raccoon has fallen into his instinctive actions of dropping the tokens on the ground.

As per the question, Otis returned to its instinctive behavior of eating the flower and therefore reflects instinctive drift.

answer; did not understand that the act was wrong because she/he was suffering from a mental illness;

answer; a group made up of people from difference cultures;