Answer:
C. To give readers background about why the author took an interest in the story
Step-by-step explanation:
In literature, an introduction serves to introduce the topics that will be explored in all the first and last sections of a book. By doing this, it attracts the attention of the readers and enables them to become more familiar with the topics that will be addressed.
Furthermore, it aims to mention the central issue and what to expect from the story and it also provides background information from the author on the reasons behind writing the story.
Although the full passage is not clearly observed in the image provided, it contains "my social history of..." which indicates that the author is writing about her personal experience and then informs the reader about the details that will be encountered further on.