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.

Q: Which part of an atom is involved in chemical reactions?  
 (A) nucleus and its particles (B) negatively-charged particles (C) neutrally-charged particles (D) positively-charged particles

A: B
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Q: Which is an example of a form of electrical energy?  
 (A) lightning (B) windmill (C) radio waves (D) sound waves

A: A
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Q: Two workers are using a scaffold. One worker weighs 180 lbs. and the other weighs 200 lbs. Impact effects are assumed to increase the live load of the workers' weight by 25 percent. What is the resultant maximum live load, in pounds, that can be expected from the two workers supported by the scaffold?  
 (A) 380 lbs. (B) 475 lbs. (C) 625 lbs. (D) 950 lbs.

A:
B
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