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 type of organism is at the lowest level of the food chain?  
 (A) autotroph (B) heterotroph (C) carnivore (D) omnivore

SOLUTION: A

PROBLEM: A light-year is a measure of  
 (A) time. (B) energy. (C) distance. (D) direction.

SOLUTION: C

PROBLEM: A research team has made new discoveries about magnetism. Which of these statements best describes the value to society of publishing their discoveries?  
 (A) Their results will be unchangeable. (B) The research team may become famous. (C) The publishing company may make money. (D) Their discoveries can be built on by other researchers.

SOLUTION:
D