Explanation:

This is an analogy question where we need to identify the relationship between the first pair of words and apply the same relationship to the second pair. \nFirst pair: **Settlement : injury**\nRelationship: A 'settlement' is a payment or compensation received as a result of an 'injury'. So, the relationship is 'payment received : reason for receiving payment'. \nSecond pair: **Pension : ?**\nApplying the same relationship, 'pension' is a payment or regular income received. We need to find the 'reason for receiving pension'. \nLet's evaluate the options:\nOption (A) **pensioner**: A pensioner is a person who receives a pension, not the reason for receiving it. So, this is incorrect.\nOption (B) **maturity**: Maturity refers to a state of being fully developed or the end of a financial instrument's term. While related to age, it's not the direct reason for receiving a pension. So, this is incorrect.\nOption (C) **retirement**: Retirement is the act of leaving one's job or ceasing to work, typically due to age or service. A pension is commonly received after retirement. This fits the 'payment received : reason for receiving payment' relationship. So, this is correct.\nOption (D) **age**: While age is often a factor for retirement and thus for receiving a pension, 'retirement' is the more direct and encompassing reason for the payment of a pension, similar to how 'injury' is the direct reason for a settlement. So, this is less precise than 'retirement'. \nTherefore, the correct option is (C).