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: In 1609, Galileo Galilei used lenses to construct the first telescope. His telescope allowed him to observe many objects in space. His invention of the telescope and the data he gathered directly contributed to the understanding that
(A) Earth is the center of the universe. (B) the planets revolve around the Sun. (C) all stars eventually explode. (D) the universe has many galaxies.
Output:
B