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:
If an atom has two protons and three electrons, then the atom is  
 (A) positively charged. (B) negatively charged. (C) radioactive. (D) neutral.
answer:
B


question:
Alan is using cabbage juice to determine the relative pH of various household solutions. Which of these steps communicates the results of his investigation?  
 (A) Conduct multiple trials (B) Write down a procedure (C) Identify the materials to be tested (D) Record observations and data in a journal
answer:
D


question:
Which pair of instruments can be used to measure wind chill?  
 (A) barometer and wind vane (B) wind vane and anemometer (C) thermometer and barometer (D) anemometer and thermometer
answer:

D