Look at the image used by the author of "Heads Up on Sports Safety.”

An old photo of men playing football without pads or helmets.

Look at the image used by the author of "Heads Up on Sports Safety.”

The author most likely included this image from an outside resource to show how

A)stadiums have changed.
B)photographic technology has changed.
C)football uniforms have changed.
D)football strategies have changed.