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:
When building an electrical circuit, which safety precaution should be taken first?  
 (A) use a new battery (B) wear rubber gloves (C) clean the electrical wire (D) read all directions
answer:
D


question:
Leopard's opening chant suggests that he is  
 (A) unhappy. (B) confused. (C) confident. (D) generous.
answer:
C


question:
Which statement concerning metals is correct?  
 (A) Metals are soluble. (B) Metals conduct electricity. (C) Metals form a rigid structure. (D) Metals have a low melting point.
answer:

B