She is curious if the box and button that Mr. Steward will present was really capable of giving her $50,000.
In this case, we can say that the last answer option is the correct answer.
Although you have not presented the text that this question refers to, we can see from the context of your question that it refers to the short story "Button, button"
In this short story we are introduced to the following elements:
Norma's curiosity makes her think about the button and the money. This thought is so recurrent that it makes her press the button, but the consequences she faces, because of that, are terrible.
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