Tamika inflates and ties off a balloon in her classroom and then takes it outside on a cold, winter day. Immediately, she notices that the balloon has gotten a little bit smaller. Why does this occur? A. because there are fewer molecules in the balloon outside

B. because the air pressure is significantly higher when it is colder

C. because the molecules in the balloon have slowed down with the temperature

D. because the molecules shrink in size when exposed to the colder, outside air ​