Definition: In this task, you are given a multiple-choice question and you have to pick the correct option. Answer with option indexes (i.e., "A", "B", "C", and "D").
Input: how come a person can blow into a balloon and use the same air to fill a soccer ball? (A) it is the law of thermodynamics (B) it is the ability of it to conform (C) it is a shift in the cosmos (D) all of these
Output:
B