Answer:
C.“Some concussions are much more serious than the symptoms would suggest,” says Dr. Monroe, a neurologist at the Brain Center.
Explanation:
Compared to all the other answers 'C' mentions a doctor (Dr.Monroe) and since you are trying to pick the answer that is most credible...picking the one that comes from the most knowledgeable source is the most credible. So, option C. is correct.
*P.S I also got it right on Edge2020*
Its c. He beleives that advancces in blalh blah you got it
A. temporarily
because chronically means constant so the opposite would be temporarily.
