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.
THE ANSWERS ARE: -The master stopped at the rusty iron door and pulled it open on rasping hinges.-We saw him disappear down the steps into the dark,<span>-Then we heard the awful, terrifying sound that haunted our sleep</span>
