Answer:
c. thinking of the past
Explanation:
In English language, an afterthought can be defined as an act which typically involves an individual reflecting on an event or action that has happened in the past.
This ultimately implies that, an afterthought is a thought that comes into play subsequently (later) after an expedient or actions.
In this scenario, The younger was called Epimetheus, or Afterthought; for he was always so busy thinking of yesterday, or last year, or a hundred years ago, that he had no care at all for what might come to pass after a while.
Afterthought means thinking of the past.