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:
Organisms contribute to the water cycle mainly through the process of  
 (A) irrigation. (B) evaporation. (C) precipitation. (D) transpiration.
answer:
D


question:
Which material is most easily recycled at school?  
 (A) plastic wrap (B) notebook paper (C) ice cream sticks (D) rubber erasers
answer:
B


question:
Which BEST explains why green marine algae are most often restricted to the top 100 meters of the ocean?  
 (A) They have no roots to anchor them to the ocean floor. (B) They can live only where there is light. (C) The pressure is too great for them to survive below 100 meters. (D) If the algae lived below 100 meters they would be eaten by animals.
answer:

B