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 substances is correctly identified as a mineral?  
 (A) coal (B) quartz (C) granite (D) sandstone

SOLUTION: B

PROBLEM: The Grand Canyon is an example of  
 (A) erosion. (B) deposition. (C) an earthquake. (D) volcanic activity.

SOLUTION: A

PROBLEM: Over a long period of time, a rocky volcanic island that previously did not support any form of life got transformed into a dense forested region. Which of these species is most likely to have been the pioneer species that initiated this transformation?  
 (A) ferns (B) grasses (C) lichens (D) mushrooms

SOLUTION:
C