According to the Laffer Curve,

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The Laffer Curve illustrates that at both extremes of tax rates (0% and 100%), tax revenues are zero, and that there is an optimal tax rate in between these extremes that maximizes revenue. As tax rates increase from low levels, tax revenues increase up to a point, but beyond that point, further increases in tax rates lead to a decrease in tax revenues. Additionally, the curve suggests that under certain conditions, a cut in the tax rate can lead to an increase in tax revenues by stimulating economic activity. Therefore, all of the statements A through D are true descriptions of the Laffer Curve's implications.