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.

[Q]: Which tool is best used to collect information about the weather?  
 (A) ruler (B) stopwatch (C) thermometer (D) collecting net
[A]: C


[Q]: Martin is writing a report for science class about how the tilt of Earth affects living organisms. Which subject should Martin include in his report that is directly affected by Earth's tilt?  
 (A) night and day (B) cloud formation (C) phases of the Moon (D) changing of the seasons
[A]: D


[Q]: If a pond is polluted by soap that has phosphate, this pollutant will cause the algae to quickly reproduce. Which will most likely increase in the pond if this happens to the algae?  
 (A) sulfur (B) oxygen (C) nitrogen (D) carbon dioxide
[A]:
B