Answer:
Trade off can be defined as when we select on options among two or more than two options, then selecting that option will prohibits the advantages
associated with other options which we have left. For example: when you go for earning 5 mile away from your home, then certainly, you have put effort and become tired as well but you will get the money after work, so you have done trade-off there.
Opportunity cost can be termed as the cost which you bear by not enjoying and taking the benefits associated with the best available option which you leave while in the selection process. For example: you spend time watching a fantastic movie but you can't read a good story book while staying cozy at home, eating a pizza, or you can't spend the same money on something else.