Which of the following is INCORRECT?

A、I think he should get a job, but you can’t force him to if he is not ready.
B、I think he should get a job, but you can’t force him to if he is not ready to.
C、I think he should get a job, but you can’t force him to if he is not ready to get.
D、I think he should get a job, but you can’t force him to if he is not ready to do so.