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: A student finds an animal in the wild. He decides it is a bird because it has  
 (A) fins. (B) scales. (C) feathers. (D) four legs.

SOLUTION: C

PROBLEM: In which state are molecules of a substance arranged in the most orderly way?  
 (A) gas (B) liquid (C) plasma (D) solid

SOLUTION: D

PROBLEM: Which would cause the most soil to erode from a river bank in just a few days?  
 (A) animals climbing up the river bank (B) acid rain falling onto the river bank (C) heat from the sun drying the river bank (D) water from a flood flowing over the river bank

SOLUTION:
D