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: During a biochemical reaction, pyruvate (C3H4O3) is converted into carbon dioxide (CO2) and water (H2O). In what cellular organelle does this biochemical reaction occur?  
 (A) nucleus (B) cytoplasm (C) mitochondria (D) endoplasmic reticulum

SOLUTION: C

PROBLEM: Which would provide evidence of seafloor spreading?  
 (A) higher levels of salinity in the ocean water (B) stronger currents at the surface of the ocean (C) cooled magma found on the edge of the plates (D) greater reproduction levels for organisms at the bottom of the ocean

SOLUTION: C

PROBLEM: Which of the following is a description of an organism's development?  
 (A) A sunflower grows toward the Sun. (B) A Venus's-flytrap plant closes its leaves around a fly. (C) An egg hatches, grows into a tadpole and then into a frog. (D) A lizard loses its tail and grows a new one.

SOLUTION:
C