Final answer:
Different authors start a diary for various reasons including documenting experiences, expressing thoughts, and gaining approval.
Step-by-step explanation:
The author's reason for starting a diary varies depending on the specific context of the question. In the given excerpts, different authors provide their own reasons for starting a diary:
Ella Mae, a nurse during wartime, started a diary to document her experiences, maintain hope, and express her thoughts.
An anonymous girl in the Łodź Ghetto started a diary to chronicle her daily life and reflect on her experiences.
Sandra Cisneros started a diary as a young writer to explore her own growth, reflect on her life, and gain approval from her parents.