Instructions: 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.
Input: Which change will occur in the wire of an electrical circuit that is working properly?
(A) The wire will become warmer. (B) The wire will lose some of its mass. (C) The wire will form an electric field. (D) The wire will develop a new crystal structure.
Output:
A