The correct answer would be option D, Semblance of insanity.
Semblance of Insanity from the sentence clue the meaning of eccentric.
Explanation:
Eccentric are people who show unusual or odd behaviors that are not expected from a normal person. They show behaviors that are not even necessary in a situation. Such people are unconventional and slightly different from the people who are generally acceptable in the society.
For example, a person who always speak truth, even in the worst situations, would be considered eccentric, because usually people lie to get benefit, or to avoid some situations in our society, which is totally acceptable by the society. But in such situations, eccentric person would be considered unconventional, odd and a kooky person.
Eccentrics do not show signs of Distorted thinking, rather they are insanely different.
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