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.

All of the different organisms interacting in a pond make up  
 (A) a community (B) a population (C) the water cycle (D) the habitat
A

Which type of organism is the best at fixing nitrogen?  
 (A) bacteria (B) fungi (C) protists (D) animals
A

Weather patterns sometimes result in drought. Which activity would be most negatively affected during a drought year?  
 (A) boating (B) farming (C) hiking (D) hunting

B