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.

Example Input: The students in a class are making a scale model. They need a material that they can easily bend into a circle. Which of the following objects is best for the students to use?
(A) copper wire (B) glass rod (C) lead pipe (D) wooden stick
Example Output: A

Example Input: Five bowling balls are lined up touching one another on a smooth surface. Striking the first ball with a hammer makes the fifth ball move away from the group. The force of the hammer was transmitted through the line of balls as what type of wave?
(A) electromagnetic (B) heat (C) longitudinal (D) transverse
Example Output: C

Example Input: Red is dominant to white for flower color in a particular plant. If a red flowered plant (RR) is crossed with a white flowered plant (rr), what color will the offspring be?
(A) 100% pink (B) 100% red (C) 50% white, 50% red (D) 100% white
Example Output:
B