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: Surface mining is a type of mining that is done at the surface of Earth. In addition to supplying valuable minerals to industry, surface mining might also  
 (A) discourage landfills. (B) increase Earth's surface area. (C) eliminate groundwater pollution. (D) create recreational ponds and lakes.

Answer: D


Question: Joanne's science teacher cautioned the class to be skeptical when learning about new scientific discoveries. Why is it important to be skeptical about new discoveries in science?  
 (A) because many scientific discoveries are not based on facts (B) because most scientific discoveries have no scientific value (C) because most scientists make errors when formulating scientific discoveries (D) because all scientific discoveries must be examined critically before they can be accepted

Answer: D


Question: Which type of energy is needed to cut a piece of wood into smaller pieces with a saw?  
 (A) light (B) heat (C) sound (D) mechanical

Answer:
D