You are given a science question (hard-level) and four answer options (associated with "A", "B", "C", "D"). Your task is to find the correct answer based on scientific facts, knowledge, and reasoning. Do not generate anything else apart from one of the following characters: 'A', 'B, 'C', 'D'. There is only one correct answer for each question.
--------
Question: 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.

Answer: C


Question: A scientist working on a new package design wants to use a material that is highly recyclable, biodegradable, and inexpensive. The best material for the package design is  
 (A) aluminum. (B) cardboard. (C) plastic. (D) glass.

Answer: B


Question: Which of these statements is most accurate about the Sun?  
 (A) It has an infinite energy supply. (B) It is near the end of its life cycle. (C) It is in its infancy in terms of energy consumption. (D) It has consumed approximately one-half of its expendable energy.

Answer:
D