When charissa was a young child, she stepped on a bee and was stung. since that time, she has been terrified of flying insects and runs away if she sees any. what form of learning is this? a. defense mechanism b. vicarious conditioning c. observational learning d. classical conditioning?

I believe the answer is: Classical conditioning
Classical condiitoning happen when a certain biologically potent stimulus is paired with a previously neutral stimuli and make the subject the biological/psychological response everytime they exposed to that stimuli.
In the scenario above, flying insects is the stimuli and the act of running away is the response.