Read this excerpt from A Black Hole is NOT a Hole.

You know you've used a book a lot when you find cookie crumbs in the binding. Right now, my most-crumb-filled book is Black Holes & Time Warps: Einstein's Outrageous Legacy by the scientist and science writer Kip Thorne.
PLEASE HELP
In this part of the introduction, how does the author show she is writing for children?

A She writes a scientific explanation of Albert Einstein’s theory.
B She lists the name of a technical reference book.
C She writes about leaving cookie crumbs in her research book.
D She quotes the writing of scientist Kip Thorne.