The right answer is the letter D.
This is because opportunity cost is a term used in economics to indicate the cost of something in terms of a given opportunity, that is, the cost, even social, caused by the renunciation of the economic entity, as well as the benefits that could be obtained from this resigned opportunity or, even, the highest income generated in some alternative application.
In the case of the matter, there was a waiver on the opportunity to pay for a family trip, so that the family could buy a computer.
 
        
                    
             
        
        
        
1- Disagree because the wife may tell the husband to do something to please her and then the husband might not want to do what she said. He should always have a choice on what he wants to do. 
2- Disagree Just tell your friend that you lost what is theirs and then offer to buy them a replacement. It is better to not lie. 
3- Agree By telling your friend the truth it makes you a better person by not lying and it build trust in the friendship 
4- Agree You could be rich and have the material items you could ever want but you may be very sad because you have no friends who care for you
        
             
        
        
        
I think the most important lesson that the story Beowulf could give to our modern time leaders is : The way to behave on a crisis
In the story , Beowulf have to face many problems that in the perception of others are an impossible cause. But his bravery lead him to able to solve that problems.
But he has godlike ability which we normal humans don't have. Just food for thought
hope this helps