Answer:
Oppotunity cost is the value of the foregone items.
Explanation:
Opportunity cost refers to the worth of the next best alternative that you give up everytime you make a decision. It is a loss incurred by choosing one option over the other.
For example, if you walk to a shop and buy a new phone. The money spent on purchasing the phone cannot buy anything else. If the next best alternative to the phone was a watch, then the opportunity cost of the phone is the value of the foregone watch.