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: Which of these is a nonliving part of a forest?  
 (A) Tree (B) Soil (C) Worm (D) Mushroom

SOLUTION: B

PROBLEM: Sickle cell anemia is a genetic disease caused by an autosomal recessive gene. If each parent carries one sickle cell allele, what are the chances that their child will have sickle cell anemia?  
 (A) no chance (B) one in four (C) two in four (D) three in four

SOLUTION: B

PROBLEM: A pan containing hot water is left on the counter and becomes cool mainly due to  
 (A) water molecules moving apart. (B) cold air penetrating the hot water. (C) heat from the water moving into the cooler air. (D) hot water reacting with the metal pan.

SOLUTION:
C