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: Thermometers (A) can tell you if you need an umbrella that day (B) can tell you which direction the wind is blowing (C) can help you decide how many layers of clothes to wear outside (D) can tell you how much rain has fallen
Output:
C