Johnny has always feared going to the dentist as he associated these visits with pain. After repeated visits to the dentist, Johnny also developed the fear of bright lights as he had started associating it with the dentist's cabin. In the given scenario, the development of Johnny's fear of bright lights is due to .

counter-conditioning

Explanation:

Based on the scenario being described within the question it can be said that this development is due to counter-conditioning. This term, also referred to as stimulus substitution, is when an individual associates a positive stimulus to an unwanted behavior or response that would otherwise not be associated with. Which is what Johnny has done by associating the lights to the dentist's office which he hates.

the answer might be either a or c. can't be too sure , because i searched the web, but no valid answers came through.

you should try adrenaline. it kicks in in situations like this.