The correct answer is letter D
Delayed reinforcement is a time delay between the desired response and the reward in the Operant Conditioning.
Operant conditioning (sometimes referred to as instrumental conditioning) is a method of learning that occurs through rewards and punishments for behavior. Through operant conditioning, an association is made between a behavior and a consequence for that behavior.
<span>Eric Foner believed that freedom is an effective theme
to focus on in the study of American history because of what happened in the
past during the American civil war the nation faced many controversial issues
such as slavery. Because one of the problems of this American period was
slavery. Furthermore, over three million African-Americans were slaves in the
South and this means that they worked for other people but had no freedom and
received no money for their work.</span>
