Which of this is the best question to address the societal issue in this excerpt

Give an example of a situation in which an individual's pursuit of economic self-interest may not benefit but instead harm the rest of society

Nami conducts an investigation on plants. she places a grow light on a timer to give the plants different amounts of light to see if this would affect their growth. in this investigation, the amount of light is the .

What is the cause of their extinction