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:
Spring tides occur during which lunar phases?  
 (A) first quarter and last quarter (B) full moon and new moon (C) when the moon is waxing (D) when the moon is waning
answer:
B


question:
A student has just completed a laboratory activity. What is the last action that the student should perform before leaving the lab area?  
 (A) wash hands (B) turn off all equipment (C) put away all glassware (D) wash instruments and table tops
answer:
A


question:
Raising livestock, such as sheep and cattle, results in the production of large amounts of methane gas (CH4). Methane has the same effect in the atmosphere as carbon dioxide (CO2). As more livestock are raised to provide food for humans, what is the most likely effect of the increase in methane?  
 (A) acid rain (B) ozone thinning (C) water pollution (D) global warming
answer:

D