TASK 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.
PROBLEM: In 1971, the bones of an extinct flying dinosaur were discovered. This kind of discovery helps everyone learn more about  
 (A) impact of humans on Earth. (B) effect of gravity on animals. (C) history of animal species on Earth. (D) likelihood that dinosaurs will reappear.

SOLUTION: C

PROBLEM: Which scientist is credited with using a telescope in the seventeenth century to discover the moons of Jupiter?  
 (A) Galileo (B) Kepler (C) Einstein (D) Newton

SOLUTION: A

PROBLEM: Students measure the time for toy cars of different masses to roll down a hill. Which of the following units should the students use to measure time?  
 (A) centimeters (B) grams (C) milliliters (D) seconds

SOLUTION:
D