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: The fossils of dinosaurs that lived millions of years ago can be found in  
 (A) the water of oceans. (B) the ice on ponds. (C) the trunks of trees. (D) rocks in the ground.

SOLUTION: D

PROBLEM: The fusion reaction that fuels the Sun converts hydrogen into  
 (A) carbon. (B) iron. (C) neon. (D) helium.

SOLUTION: D

PROBLEM: Which group of organisms would all be found living in a tropical rain forest?  
 (A) Lizards, insects, cacti, kangaroos (B) Vines, palm trees, tree frogs, monkeys (C) Evergreens, moose, weasels, mink (D) Lichens, mosses, caribou, polar bears

SOLUTION:
B