instruction:
You are given a science question (easy-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 bright object with a long tail of glowing gases is in orbit around the Sun. This object is most likely  
 (A) a planet (B) a star (C) an asteroid (D) a comet
answer:
D


question:
Compared to Earth, the Moon is  
 (A) drier. (B) larger. (C) heavier. (D) brighter.
answer:
A


question:
Which of the following is the primary way that evergreen trees planted on the north and west sides of residences in Massachusetts help reduce winter heating costs?  
 (A) They insulate against cold air. (B) They optimize solar heating. (C) They reduce radiant cooling. (D) They act as a windbreak.
answer:

D