According to Aristotle, the metrical arrangement of words refers to Diction.
In The Boy Who Harnessed the wind, William clubs the windmill and faces the villagers, who think he is foolish.
I am not sure I understand your multiple choices for answers, but the correct words to put into your sentence are: 'explains', and 'is'. Because the word 'either' has been used, that changes the the word after lantern from multiple to singular.
Answer:
Understanding where one fits into society can be either a challenge or an opportunity.
Explanation:
I took the quiz