If u r referring to the book The Giver then ur answer is because he drowned in a river and the family need a replacement child to fill in his place.
Answer:
C. The acrobat was as agile as a monkey.
Explanation:
The other examples show laziness and clumsiness, while agile means to move quickly and easily.
The sentence that contain simple subject would be : C. The rain came down in the sheets
A Simple subject is basically a subject that doing the action. In this case, the rain is doing 'came down'
Hope this helps