Context: Two identical aquariums were next to an open window. One aquarium had a plastic cover on it, and the other was uncovered. This table shows how the temperature of each aquarium changed over 1.5hours.
During this time, thermal energy was transferred from () to ().
A. the surroundings . . . each aquarium
B. each aquarium . . . the surroundings
From the given choices, pick the correct answer and respond by indicating the letter of the correct option.

B