Answer:
The personal fable.
Step-by-step explanation:
The personal fable is a belief or notion that one perceives about himself/herself common during adolescence. They perceive themselves to be too unique a person ever walked on the planet. They believe that no problems can affect them regardless of their behavior.
In the given case, Sandy is exemplifying a personal fable. It is because she is using toxic chemicals without face mask and spraying pesticides and weed killer abandon. She is perceiving that these toxics can not harm her because she is young and healthy. It is a personal fable.
Thus, the correct answer is personal fable.