Acouple has decided to increase their income from investments for when they retire in twenty years. which is the best way they can accomplish that goal?

to enroll in a 401k and investing in the stock market.

Explanation:

According to my research on investment strategies, I can say that based on the information provided within the question their best options to accomplish their goal would be to enroll in a 401k and investing in the stock market. The 401K is a retirement fund that grows over years and the stock market also provides a decent ROI for your money, especially stocks like the S&P 500 which are the safest options and grow steadily over years.

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answer; i believe its (d) intrinsic;