The best answer to this is B option. This is an oxymoron. An oxymoron is a contradictory phrase.
        
                    
             
        
        
        
Hello. You did not inform the text to which this question refers, which makes it impossible for this question to be answered accurately. However, I will try to help you in the best possible way.
It is only possible to know the question that the text raises with the reading of the text, however, through the question above we can see that the question is at the end of the text. In addition, you must know that every question must be marked with a question mark (?) at the end of the sentence. In this case, when observing the sentences that end with an question mark , at the end of the text, you will find the question that the author asks the readers to reflect on.
 
        
             
        
        
        
A dash should be inserted after the word nanoscale
        
             
        
        
        
 Because it is not the actual word
        
             
        
        
        
Answer:
following a preposition is more than two objects.
Explanation:
in," "at," "on," "of," and "to."