PLEASE HELP What is opportunity cost?

the limited availability of goods or services
a benefit lost when choosing between two options
the resources used to produce finished goods or services
a system of directly exchanging goods or services for other goods or services

Tobias wolff most likely named his short story "mortals" because the story explores the theme of people coming to terms with the idea that one day they too will die. wanting to find out what their loved ones really think of them. achieving immortalit by being "big people" while they are alive. hoping that they will have accomplished something before they die.