From the list below, what is the best example of a behavioural nudge?

Question

BlackTom AI · Accepted Answer

The question asks for the best example of a behavioural nudge from the provided list. 
Option a: A tax added to the price of petrol. This is a financial disincentive that changes behavior through a price signal, but it operates via regulation and taxation rather than a subtle choice architecture nudge. It’s more of a policy lever than a gentle behavioral prompt. 
Option b: A financial penalty (fine) for leaving rubbish in a public space. This is a punitive measure designed to deter an action through fear of a cost, not a soft prompt or structure that guides choice; it’s not a nudge in the behavioral economics sense. 
Option c: A subsidy paid to consumers of education. This is an economic incentive to increase demand for education, a direct subsidy rather than an alteration of choice architecture or the choice environment. While it can influence behavior, it’s not a nudge that leverages default options, framing, or easy-to-take pathways. 
Option d: Placing healthy food at eye level on supermarket shelves. This is a classic example of a behavioural nudge: it subtly alters the environment to make the desired (healthier) option more salient and easier to choose without restricting choice or imposing a penalty. It leverages default visibility and convenient placement to steer behavior in a low-friction way. 
In summary, the first three options represent broader policy tools (taxation, penalties) or direct financial incentives, whereas option d illustrates a subtle, choice-architecture-based prompt consistent with a behavioural nudge. This makes option d the best example among the choices.

From the list below, what is the best example of a behavioural nudge?单项选择题

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Which of the following is not an example of a behavioural nudge?