The correct answer is C. Retired.
A superannuated person is one who is retired from work, typically because they have reached a certain age or have completed a certain number of years of service. The word “superannuated” comes from the Latin words “super” meaning “above” and “annus” meaning “year.”
The word “accepted” means to be approved or welcomed. The word “senile” means old and showing signs of mental or physical decline. The word “experienced” means having had a lot of practice or training in a particular activity.
While all of these words could be used to describe a retired person, the word that is most closely synonymous with “superannuated” is “retired.”