Answer:
d. encouraged entrepreneurs to come to the U.S. through "investor visas."
Explanation:
The immigration Act of 1990 was enacted in order to invite capital owners from foreign country into united states. The government hoped that this will resulted in reduction of unemployment rate in united states and stimulate the economy in the long run.
This was the reason they prioritized immigrants who can come through "investor visas." This method was granted for people who have enough wealth to opened new businesses in united states.