Instructions: 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: School children often play a musical instrument by (A) sweeping thumb across elastic band over a beverage carton (B) making rubber band chain bracelets (C) wearing rubber bands with braces (D) shooting rubber band with one hand
Output:
A