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: A polished metal ball looks very shiny and bright on a sunny day. What makes the ball look shiny?  
 (A) The ball makes light. (B) The ball reflects light. (C) The ball absorbs light and then releases it. (D) The ball absorbs light and keeps it inside.

SOLUTION: B

PROBLEM: Black fur is dominant to white fur in guinea pigs. If two black guinea pigs (Bb) are crossed, what color will the fur of their offspring be?  
 (A) 100% black (B) 100% white (C) 50% black, 50% white (D) 75% black, 25% white

SOLUTION: D

PROBLEM: A student left a bar of chocolate in the sun on a hot day. As the chocolate melted, which property changed?  
 (A) its mass (B) its shape (C) its weight (D) its composition

SOLUTION:
B