instruction:
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.
question:
About how long is a lunar cycle?  
 (A) 1 day (B) 1 week (C) 28 days (D) 52 weeks
answer:
C


question:
Which of these technologies helps a power company use renewable energy for the production of electricity?  
 (A) hydroelectric power (B) nuclear power plants (C) natural gas generators (D) coal-fired power plants
answer:
A


question:
Some sea grasses grow near a group of palm trees on a sandy shore. Which best describes the role of both the palm trees and sea grasses?  
 (A) They get energy from living organisms. (B) They turn decaying matter into nutrients. (C) They provide food for other organisms. (D) They absorb oxygen from the environment.
answer:

C