Answer:
A. Oxymoron
Step-by-step explanation:
An oxymoron is a figure of speech in which two terms with opposing meanings are used together intentionally; it is often used for dramatic effect, to attract the reader's attention or make them think or laugh. The statement uses oxymoron when using the words "active" and "retirement": something active moves about vigorously or frequently or has a busy or lively activity, while retirement is characterized by ceasing to work and being in a more calmer and less busy state.