Which biographical fact about the author of A Black Hole is NOT a Hole makes her a credible source?

She has written other books for children.
She has two cats and lives in Massachusetts.
She works with NASA on science programs.
She works as a volunteer in her town government.

Which sentence is an example of objective, third-person writing that could be found in a scientific essay? a. i was 15 years old when i developed an eating disorder. b. my sister developed an eating disorder when she was a teenager. c. eating disorders often appear during the teen years. d. you are most likely to develop eating disorders during your teenage years.