Kayla's core body temperature has risen 1.5 degrees in the last half-hour.Which of the following is most likely

A)  Kayla has been meditating for the past 30 minutes. 
B)  Kayla has just fallen asleep. 
C)  Kayla will fall asleep in the next 60 minutes. 
D)  Kayla has just woken up.

When we sleep, our core body temperature drops, not rises. Meditating might cause relaxation but it wouldn't necessarily cause a rise in body temperature. We cannot predict if Kayla will fall asleep in the next 60 minutes, so we cannot choose option C. Therefore, the most likely explanation is that Kayla has just woken up and her core body temperature is gradually rising as she becomes more active.