Context: The passage below describes an experiment. Read the passage and then follow the instructions below.

The students in a physics class inflated 30 identical balloons to the same size. The students placed half of the balloons in freezers at 0°F and left half of the balloons at room temperature, which was 68°F. Three hours later, the students measured the sizes of the balloons. They compared the sizes of balloons kept at room temperature to the sizes of balloons kept in freezers.
Figure: inflating a balloon.
Identify the question that the students' experiment can best answer.
A. Do balloons kept in freezers have more mass than balloons kept at room temperature?
B. Do balloons get smaller when they are kept in freezers or at room temperature?
From the given choices, select the correct answer and reply with the letter of the chosen option.

B