Lawrence Earns $X in His Current Job

Lawrence earns $X in his current job. If he weren't working at his current job, he would be working at another job earning $Y. It follows that

A) Lawrence is not earning any economic rent in his current job.
B) Lawrence is earning economic rent in his current job if $X - $Y is a positive dollar amount.
C) Lawrence is earning economic rent in his current job if $X - $Y is a negative dollar amount.
D) Lawrence is earning pure economic rent in his current job.
E) Lawrence is definitely earning some economic rent in his current job.