TASK DEFINITION: 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.
PROBLEM: What unit of measurement would be used to describe the melting point of a substance?  
 (A) liters (B) grams (C) degrees (D) centimeters

SOLUTION: C

PROBLEM: Rhinoceroses and horses are related. They have very similar digestive systems and an odd number of toes on their feet. Horses have one toe, and rhinoceroses have three. These facts best support which claim?  
 (A) Horses and rhinoceroses share a common ancestor. (B) Horses and rhinoceroses are genetically identical. (C) Horses are the ancestors of modern rhinoceroses. (D) Horses have descended from modern rhinoceroses.

SOLUTION: A

PROBLEM: Which of these is a way that sunglasses help protect the eyes?  
 (A) reflecting light rays away from the eyes (B) refracting more light rays into the eyes (C) reflecting more light rays into the eyes (D) refracting light rays away from the eyes

SOLUTION:
A