Tanika is writing a research paper about the basics of genetics for her science class.

Which nonfiction text would be the best source for her paper?

“What Is a Gene?” an article written for the US National Library of Medicine in 2018
“The DNA Geek,” a blog written by an amateur scientist about DNA and genetics
“What I Learned about Me,” an advertisement promoting genetic testing to learn about one’s family history
“Family History: Clues in Census Records, 1850–1920,” an article from a 1998 edition of the Record