Task: Question Answering
Input (English): A student observed a rock made up of many small particles of sand arranged in light-colored layers and dark-colored layers. Which of the following statements describes how this type of rock most likely formed?  
 (A) Clay was crushed and frozen under a glacier. (B) Lava from a volcano cooled quickly in water. (C) River sediments were slowly compacted and cemented together. (D) Mineral deposits hardened into solid rock in underground caves.
Output (English): C