According to trickle-down economics, which of the these increases economic growth?
A) a decrease in taxes for investors
B) a decrease in the demand for goods
C) an increase in capital gains taxes
D) an increase in government regulation

According to trickle-down economics, a decrease in taxes for investors  increases economic growth.

Explanation:

A decrease in taxes for investors is the reason for the increase in economic growth. Trickle-down economics, also known as trickle-down theory, refers to the economic principle that taxes on corporations and the wealthiest in society should be lowered as a way of encouraging short-term corporate activity and long-term benefits for society at large. Supporters of supply-side economic policies such as "Reaganomics" have used the concept in recent times.

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