Answer
(a) The patient may think they were okay.
(b) Patient b
Work Step by Step
(a) If patient A did not understand the negative sign, patient A would think that he/she was in the healthy range when he/she was in the unhealthy range. Thus, we see the importance of understanding negative signs.
(b) Patient B is the patient where the sign of the score does not impact the result. After all, Patient B's score is 0, and 0 is neither positive nor negative.