When Holly injures her shoulder playing baseball, she uses an instant ice pack to reduce the swelling. She breaks the inner, activator portion of the instant cold pack releasing the solid urea into the surrounding water. What process does Holly observe as she uses the cold pack?
A) Urea absorbs and releases heat energy into the surroundings.
B) When the urea dissolves it absorbs heat and the cold pack gets colder.
C) The urea causes the surroundings heat up as the cold pack releases energy.
D) As the urea mixes in the water it releases heat making the cold pack colder.
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