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.

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

[EX Q]: Which series correctly represents the levels of organization in an organism?  
 (A) cells -> organs -> organ system -> tissue (B) cells -> tissue -> organs -> organ system (C) tissue -> cells -> organ system -> organs (D) tissue -> organ system -> cells -> organs
[EX A]: B

[EX Q]: What features do all insects have?  
 (A) Number of LEGS 2 Number of BODY PARTS 4 (B) Number of LEGS 4 Number of BODY PARTS 2 (C) Number of LEGS 6 Number of BODY PARTS 3 (D) Number of LEGS 8 Number of BODY PARTS 3
[EX A]:
C