During the night, the air temperature is $3\,^{\circ}\text{C}$. Someone goes outdoors for $30$ minutes, and their body temperature decreases. What could explain this change in temperature?
- AThe person cannot get rid of carbon dioxide.
- BThe person has too much glucose for respiration.
- CThere is less oxygen in the cold air breathed in.
- DThe respiratory enzymes function more slowly.