PLEASE HELPPPPPP ENGLISH MASTERS <333

What impact does the rising action have on this story?

It introduces the central conflict of the story: Bella's uncertainty about who wrote the letters.
It builds the suspense of the story: Bella has no idea who is sending the love letters or why, and neither does the reader.
It establishes the setting of the story by contrasting Bella's modern practices, such as texting, with Abuela's practices, such as letter writing.
It introduces readers to the motivations of the main character: Isabella.