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.

[EX Q]: Which would be the best method to use to dispose of cardboard boxes not utilized by a local grocery store?  
 (A) burn them once a month (B) send them to be dumped in a remote area (C) have them recycled for future paper products (D) put them into a dumpster with the rest of the trash
[EX A]: C

[EX Q]: Many things can contribute to the development of a theory. A student made a list of some things that might help scientists develop a theory. Observations Calculations Conversations Publications From the student's list, which must be used in the development of every theory?  
 (A) Observations (B) Conversations (C) Publications and calculations (D) Calculations and conversations
[EX A]: A

[EX Q]: Farmers in the 1800s used axes to clear trees from farmland. Now, farmers use chainsaws to clear the trees. How do chainsaws most likely help farmers?  
 (A) Farmers can cut different types of trees. (B) Farmers can remove more trees in less time. (C) Farmers can replant more trees in the fields. (D) Farmers can produce more products from the trees.
[EX A]:
B