Answer:
Opportunity cost refers to what you have to give up to buy what you want in terms of other goods or services. ... For example, “cost” may refer to many possible ways of evaluating the costs of buying something or using a service. Friends or newscasters often say “It cost me $150 to buy the iPhone I wanted.”
Explanation:
 
        
             
        
        
        
I chose b. prepare to host a party or an event.
                                                    My Party
I first would buy all my materials at the cheapest price. Then, I would set everything up at my place I am hosting the party or event. Next, I would put up decorations so everyone will admire it. Last but not least, I will get ready with return gifts so everyone will have a good memory of the party I hosted or the event. Finally, I will get ready for everyone to come and hand them flowers as a welcome gift.
        
             
        
        
        
Answer:
Idioms 
Explanation:
Metaphor- Is used to describe an object or action that is literally true.
EX- Its raining cats and dogs 
Similes- A comparison of one thing to another
EX- You were as brave as a lion
Idioms- A common phrase which means something different from its literal meaning.
Ex- Stabbed in the heart
Ex- Kill two birds with 1 stone
Clichés are used in older books like Shakespeare and the Odyssey 
 
        
             
        
        
        
I’d say why could mean another word for purpose