Which variable is most important to the following problem?

at 10: 00 a. m., a patient's temperature was 101.5 degrees. at 1: 00 p. m., the nurse took the patient's temperature again and found it was 105.8 degrees, the highest ever recorded. how long did it take for the patient's temperature to reach a record high?

a.
the number of hours it took for the temperature to reach its peak

b.
the number of degrees that the temperature changed

c.
the degree measure for the record-breaking temperature