Refer to the Introduction section where the identity of the rate- determining reaction was discussed. Suppose that the rate constant for reaction (1a) increases by 2% for each increase of 1 oC, and the rate constant for reaction (1a) increases by 20% for each increase of 1 oC. What would be the percent decrease in the observed elapsed time when the temperature increases by 1 oC? a. 2%.b. 20%.c. 2+20= 22%.d. 0.02 X 20 = 0.4%.