How do you know what the genre of a book is? or how do you know why this genre is the genre of the book?

it is confusing for me.

Excerpt from “mundra” by emily t. sheets part a what is a central idea of this story? a. mundra and her mother-in-law struggle to build a relationship. b. mundra has difficulty adjusting to life after she loses her parents. c. a young woman works to do all that she can to gain acceptance from her community. d. a young woman demonstrates tremendous strength while enduring cruel treatment. part b which quotation from the story best develops the response to part a? a. “at first their death had meant little to the child for she was no longer a part of their household.” b. “at the time of mundra's wedding the people had been anxious because rain had not come and the crops were dying.” c. “"bring water," the old woman commanded fiercely and with a thrust of her foot sent the child, who had reached the door by that time, reeling in the direction of a large brass water pot which stood in a corner of the mud porch." d. “the small, dark, thin figure walked very straight because of the jar on the head, not from any sense of pride, for what had mundra to be proud of? ”