Which psychological principle did the UK Government's 'Behavioral Insights Team' (Nudge Unit) successfully apply to increase tax compliance rates by over 15% in their communications?

Government agencies worldwide have been revolutionizing their communication approaches through digital tools and behavioral insights. This poll tests your knowledge about how modern governments are using consumer psychology principles to improve citizen engagement, service delivery, and policy compliance. From nudge theory to visual storytelling in public campaigns, how well do you understand the intersection of consumer psychology and government communication?

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Social proof messaging (stating that most people in the recipient's area had already paid their taxes)
Scarcity marketing (emphasizing limited-time amnesty periods for late payments)
Authority principle (featuring signatures from high-ranking officials on all notices)
Loss aversion (calculating exact monetary penalties that would accumulate weekly)