The observation that people acquire phobias of ancient sources of threat (such as snakes) much more readily than modern sources of threat (such as electrical outlets) can best be explained by: A....

The observation that people acquire phobias of ancient sources of threat (such as snakes) much more readily than modern sources of threat (such as electrical outlets) can best be explained by:

A. classical conditioning.                                                C. observational learning.

B. operant conditioning.                                               D. preparedness/an evolved module for fear learning.