Definition: 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.
Input: Particle accelerators, such as the Large Hadron Collider in Europe, accelerate subatomic particles to great speeds. These particles move in opposite directions at nearly the speed of light and collide into one another to simulate conditions that were present as the universe formed. Which property of matter in the initial moments of the universe are these accelerators designed to simulate?
(A) low density (B) high energy (C) massive nuclei (D) circular movement
Output:
B