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.

[Q]: 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
[A]: D


[Q]: What is the most likely outcome of the Moon moving away from Earth?  
 (A) A lunar day is shorter. (B) A lunar eclipse lasts longer. (C) Earth moves closer to the Sun. (D) Earth's tides decrease in size.
[A]: D


[Q]: The pull of gravity on Earth is a direct result of the  
 (A) mass of Earth. (B) magnetic field of Earth. (C) rotation of Earth on its axis. (D) weight of Earth's atmosphere.
[A]:
A