Over the course of the passage, the main focus shifts
from a
A
:
..
.

"Dickens had done.” Thus the passage's overall focus shifts from the narrator's love of reading to a specific incident that influences his decision to become a writer. ... Choice C is incorrect because the passage focuses on the narrator's desire to write rather than on whatever skill he may have as a writer.

Hope this helps

the purpose of a nonfiction text is to give the text a rap up. for example, when i say : frogs are interesting animals is an ending. then when i say: frogs are unique in different ways. that is an intro.