in the paragraph that begins on the bottom of page 2 and ends on the top of page 3 why does the author say that brain injuries are "almost impossible to detect

To show the coaches are not to blame for misdiagnosing brain injuries

Explanation: I’m also taking the test to on i-ready and was looking for the answer until I saw that someone else was also struggling for it so in the end I ended up reading the article and answering the question so I hope this helps.

the answer a: perseverance !

i think it is d tell if im wrong