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.

Q: Two chemicals react in a beaker that has water droplets on the outside of the bottom of the beaker. The water droplets freeze. Which statement best describes the reaction?  
 (A) Endothermic because energy is absorbed. (B) Endothermic because energy is released. (C) Exothermic because energy is absorbed. (D) Exothermic because energy is released.

A: A
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Q: What is the best practice to follow when completing an experiment?  
 (A) using caution when handling hot glassware (B) turning off burners when you are not using them (C) studying lab procedures prior to conducting the experiment (D) checking with your teacher on the procedure to dispose of chemicals

A: D
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Q: Why do scientists perform multiple trials of the same experiment?     
 (A) to include additional variables in the experiment (B) to complete the steps of the experiment in less time (C) to find a less expensive way to conduct the experiment (D) to increase the likelihood of accurate experiment results

A:
D
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