What do the endnotes in “Heads Up, Humans” suggest about the author’s research for her argument?

Question

Responses

She relied on internet publications.
She relied on internet publications.

She strictly used statistical sources.
She strictly used statistical sources.

She primarily focused on opinion pieces.
She primarily focused on opinion pieces.

She consulted a variety of sources.
She consulted a variety of sources.

Answer 1

The endnotes in “Heads Up, Humans” suggest that the author consulted a variety of sources.