Final answer:
The advertising company has used the technique of persuasion through association to convince you to buy the candy bar by creating a positive association between the heroic actions of the video game character and the consumption of the candy bar.
Step-by-step explanation:
The advertising company has used the technique of persuasion through association to convince you to buy the candy bar. By showing your favorite video game character climbing to the top of a mountain, fighting a monster, and then picking up a candy bar, the ad creates a positive association between the heroic actions of the character and the consumption of the candy bar. This technique aims to persuade you that eating the candy bar will make you feel like a hero.