Given the task definition and input, reply with output. In this task, you're given an article, a question which often contains a blank and four options (associated with "A", "B", "C", "D"). Your task is to find the correct answer (from the given options) for the question from the given article and return one of the options from "A", "B", "C", and "D". 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.

Article: Fame troubled Marie Curie and also her husband, because science was their world and in their world of science fame and honor had no value. One day, when a writer for a newspaper tried to ask Marie about herself and her thoughts and her belief, she answered him, "In science we must be interested in things, not in persons." Much of the real character and spirit of this unusual woman is found in these few words, which she was later often to repeat. One evening, at a big party, a friend asked if she would like to see the king of Greece, who was also a guest. She answered in her simple manner, "I don't see the value of it." Then, seeing that she had hurt the feeling of her friend, she quickly added, "But...but...of course, I shall do whatever you please, just as you please.
Question: The valuable thing to Marie Curie was _ .
Options: (A) science and research (B) fame and honor (C) character and spirit (D) persons and things
A