As a child, Nelson accidentally disturbed a wasp's nest and was stung by several wasps. He now has a phobia of flying insects. Which of the following best explains the acquisition of Nelson's phobia?

Operant conditioning involves learning through consequences, such as rewards or punishments, rather than through association between stimuli. While this type of learning can affect behavior, it does not apply to the development of Nelson's phobia since his fear arose from a traumatic experience rather than reinforcement or punishment related to his actions.

Observational learning occurs when an individual learns by watching others, rather than through direct experience. While it can lead to the acquisition of fears, there is no indication that Nelson observed others exhibiting fear of flying insects before developing his own phobia, making this choice irrelevant in explaining his situation.

Rote learning refers to memorization through repetition and does not involve the emotional responses associated with phobias. Since Nelson's fear of flying insects is rooted in a traumatic event rather than a learned fact or concept, rote learning does not apply to the acquisition of his phobia.