According to President Reagan’s model for supply-side economics, the first step to triggering a cycle of growth was:

The correct answer is A. reducing taxes.

President Reagan’s model for supply-side economics posited that by reducing taxes on individuals and businesses, it would increase disposable income, incentivize spending and investment, and ultimately stimulate economic growth. This approach aimed to create a more favorable environment for businesses to expand, leading to job creation and increased overall economic activity. If you have more questions or need further clarification, feel free to ask!