instruction:
You are given a science question (hard-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:
Some scientists predict that as greenhouse gases change the climate of Earth, the number and strength of hurricanes will increase. In order for this to occur, the climate change would have to affect Earth by changing the  
 (A) depths of the oceans. (B) speed of currents in the oceans. (C) chemical compositions of the oceans. (D) amount of dissolved oxygen in the oceans.
answer:
B


question:
Which land feature is most likely the result of a glacier?  
 (A) large, arid desert (B) deep, bowl-shaped lake (C) long crack in the ground (D) volcanic mountain range
answer:
B


question:
A student boils 100 grams of water to form water vapor (gas). What method should the student use to determine that the mass of the water vapor is equal to 100 grams?  
 (A) measuring the amount of water vapor (gas) in the air (B) collecting the water vapor (gas) and cooling it back to a liquid (C) weighing the beaker before and after the water is boiled (D) comparing the temperature of the boiling water to the temperature of the water vapor (gas)
answer:

B