In his essay on "the tragedy of the commons," garrett hardin argues that on the open frontier it is morally acceptable to use resources in ways that would be unacceptable in densely populated urban settings. why does he think that such a moral difference exists?

 The correct answer is :  Hardin argues that most natural resources are actually common goods that must be regulated so that they can be maintained. The basic tragedy of the commons is based on the assumption that there is an open and common pasture where shepherds raise their livestock. Each pastor believes that it is more convenient for him to add more cattle to his flock to improve his earnings.Each one pursues his best interest, this is the greatest tragedy, ruin is the destiny towards which all men rush into a society where It is believed in the freedom of commons.

i would say b. research typically uses a variety of sources