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: Which term best describes the nature of all light waves?  
 (A) longitudinal (B) transverse (C) compressional (D) magnetic

Answer: B


Question: Which invention would a culture living above the Arctic Circle most likely develop?  
 (A) ice production (B) air conditioning (C) insulated clothing (D) irrigation canals

Answer: C


Question: Temperature changes along the coast are usually less extreme than temperature changes farther inland. Which of the following statements best explains why?  
 (A) It is much windier at the coast than farther inland. (B) The temperature of the land remains fairly constant. (C) It is much less humid at the coast than farther inland. (D) The temperature of the ocean remains fairly constant.

Answer:
D