By how much did emissions reduce since the introduction of the carbon tax?

The correct choice highlights a specific percentage reduction in emissions that can be attributed to the introduction of a carbon tax. The implementation of a carbon tax typically incentivizes firms and individuals to reduce their carbon footprint by making it more costly to emit greenhouse gases. As a direct consequence, industries may adopt cleaner technologies, improve energy efficiency, or transition to less polluting energy sources.

In this case, the figure of 7% aligns with reported studies or empirical data indicating that after the introduction of the tax, there was a measurable reduction in emissions attributable to these behavioral changes. It reflects a balance between effective policy measures and economic activity, suggesting that the carbon tax successfully prompted a significant reduction in emissions while still allowing for economic growth.

Other choices, while indicating reductions, do not capture the specific reduction that aligns with observed data regarding the carbon tax's impact. It's important to distinguish between these percentages based on actual outcomes measured post-implementation of the tax.