The "tragedy of the commons" is (a) that cost-benefit analysis involves value judgments that we do not share in common.(b) that individual pursuit of self-interest can sometimes make everyone worse off.(c) the lack of a commons-a common place where people can come together.(d) the failure to appreciate what we have in common with other species.

The "tragedy of the commons" shows (B) that individual pursuit of self-interest can sometimes make everyone worse off.

Explanation: The "tragedy of the commons" is a concept that first appeared in an essay written by William Forster Lloyd, a British author who lived during the nineteenth century and focused mainly on the world of economics. In that way, the "tragedy of commons" refers to how a person who only pursuits his/her own interests can go against the common good and end up depleting everyone's resources. This theory is often used to show that an individual who only cares about his/her own interests is one of the main causes of global warming and pollution.