It was a mystery as to where the young girl had acquired such a cynical attitude.

mature
naive
eccentric
crazy

The correct answer is A. mature.

A cynical attitude is one that is distrustful of the motives of others and believes that the world is a harsh and unfair place. This is a common attitude among adults who have experienced a lot of disappointment or hardship in their lives. It is less common among young people, who are generally more optimistic and trusting.

The fact that the young girl in the question had such a cynical attitude is a mystery because it is not typical of her age group. It is possible that she had experienced some trauma or abuse in her past that led her to develop this attitude. It is also possible that she simply has a more realistic view of the world than most people her age.

Regardless of the reason for her attitude, it is important to remember that the young girl is still a child. She needs love, support, and understanding. She should not be judged or ridiculed for her cynical attitude. Instead, she should be helped to develop a more positive outlook on life.

The other options are incorrect because they do not accurately describe the young girl’s attitude. A naive attitude is one that is innocent and trusting. An eccentric attitude is one that is unusual or unconventional. A crazy attitude is one that is irrational or insane. None of these descriptions accurately reflect the young girl’s attitude.