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]: A pharmaceutical company developed a drug to help relieve headaches. Recently, the pharmaceutical company discovered that the drug may cause nausea in a small number of people who might take the drug. Which is the most ethical course of action that the drug company could take?  
 (A) Discontinue the use of the drug. (B) Inform people of the possible side effects. (C) Reduce the amount of drug given to people. (D) Modify the drug to include medicine that prevents nausea.
[A]: B


[Q]: As Archie walks to the park, he wonders which route would be faster. He decides to walk to the park using different routes and times how long it takes. Which should he do to make his comparison fair?  
 (A) walk to different parts of the park each day (B) walk with a different friend each day (C) walk at the same speed each day (D) walk at the same time of the day
[A]: C


[Q]: In a recycling program, which materials can be reused many times?  
 (A) steel cans (B) glass bottles (C) paper containers (D) plastic containers
[A]:
B