Hey, I was just studying this so I had to respond. I think you are right, the answer is A, b/c this doesn't make sense. It's saying that the pt. is in both R. acidosis and M. acidosis which doesn't happen (correct me if I'm wrong everyone). If the pH is WNL and both the PCO2 and HCO3 is off then it's compensated. Then it would ususally show that the PCO2 is R.acid and the HCO3 is M. ALK (or some other opposite). As far as I know they have to be opposite if it is compensated as in this problem. Does that make sense? This is how I remember it.
pH 7.35-7.45 (under 7.35 is acidic, over 7.45 is alk.)
PCO2 35-45 (<35= R.alk., >45=R.acid)
HCO3 22-26 (<22=M.acid, >26=M.alk)
Whew, I'm sooo ready for this semester to be over!!! Good luck on exams everyone!!!!