Concept:The error is a lack of consistency in possessive pronouns within the sentence.
Explanation:Part (a) uses the possessive pronoun "one's" correctly.
The same pronoun should be maintained in part (b) to keep the reference uniform.
Using "an individual's" creates an unnecessary and confusing shift in the possessive form.
The correct sentence should read: "To be able to manage one's anger is a reflection of one's psychological maturity."
Thus, the error lies in part (b), where "an individual's" must be replaced by "one's".
No other errors are present in parts (a) or (c).
Answer:(b)