Task: Question Answering
Input (English): The freezing point of nitrous oxide is -91°C. Which of the following statements best describes the effect on the particles in liquid nitrous oxide as its temperature is lowered to -91°C?  
 (A) The speed of the particles decreases. (B) The particles begin to move in a straight line. (C) The particles begin to move with a greater force. (D) The motion of the particles becomes more random.
Output (English): A