Write a question about the following article.

I ' m doing this job as one , one last job for someone I once knew . For old time 's sake . I used to do jobs like this all the time ; I used to relish the dark . I used to be a PI , a man who could find things out on the quiet .

Question:
What may be the reason for them not doing PI work anymore ?
Pick your answer from:
(I). They are n't as good at it anymore .
(II). They are n't paid enough .
(III). None of the above choices .
(IV). They are getting old .