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:
Which property of air does a barometer measure?  
 (A) speed (B) pressure (C) humidity (D) temperature
answer:
B


question:
Oxygen reacts with iron to produce rust and with hydrogen to produce water. Which statement describes both reactions?  
 (A) A different mixture is formed in each case. (B) A different solution is formed in each case. (C) Both a change of state and of elements is involved. (D) New molecules are formed but the same elements exist.
answer:
D


question:
After a period of steady increase, the rate of coal consumption was 50% higher during 2009 than it was during the year 2000. If this trend continues, which impact will coal consumption most likely have on the environment after the year 2010?  
 (A) decreased rates of deforestation (B) decreased atmospheric temperatures (C) increased amounts of radioactive waste (D) increased levels of greenhouse gas emissions
answer:

D