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 best describes wind energy?  
 (A) limited (B) renewable (C) damaging (D) inexpensive

SOLUTION: B

PROBLEM: Joann repeatedly overfed the fish in the pond behind her house. The nitrates from the excess food contributed to an overgrowth of algae. To correct the problem, Joann added more plants to the pond. How will adding more plants help?  
 (A) The plants make the pond look beautiful. (B) The plants will camouflage the green algae. (C) The plants will compete with algae for nutrients. (D) The plants will provide all the food for the fish.

SOLUTION: C

PROBLEM: Noah studied different systems in the human body. Which best describes a function of veins in the circulatory system?   
 (A) carrying blood from the body to the heart (B) supplying nutrients from the intestines to the body (C) carrying carbon dioxide from the body to the lungs (D) passing waste materials from the blood to outside the body

SOLUTION:
A