Final answer:
The study reveals varied effects based on individual choices in the free market.
Step-by-step explanation:
The study of the free market's effect on people who live in a free enterprise system reveals varied effects based on individual choices (d). It is important to note that the free market can have both positive and negative impacts on individuals depending on their decisions and circumstances. For example, individuals who make good choices and take advantage of the opportunities provided by the free market may experience positive effects such as increased income and wealth. On the other hand, individuals who make poor choices or face unfavorable market conditions may experience negative effects such as financial instability or inequality.