Free choice is the opposite of force.
If someone walks up and physically pushes you off a chair, then you don't have choice, you just fall off. That is physical force.
If someone says 'let me have your watch' they are probably just asking. Your choice is yours.
If someone says 'let me have your watch or I won't love you anymore', they are not using force - just pressure. Claiming 'I didn't have any choice' is just silly.
If someone holds a knife to your throat and says 'let me have your watch or I'll kill you' they are applying force. You still have choice, but the choice is under duress. People say 'I had little choice', because they will lose the watch anyway - either now, or a few moments later when they are dead.
Often people say 'I had little choice' when in fact they mean that the choice was easy. If your employer says 'you will work overtime tonight or I will sack you', you have a choice. If working a few more hours is vastly preferable to losing your job, the choice is easy. Moreover, unlike the mugger example above, you have a choice of removing yourself from the situation completely - by finding another job.
If someone cut your throat and then took your watch as you were trying to stop the bleeding, then they have also used force - but in that case there was probably no choice at all.
By the above definition, irrational entities are not capable of free choice. Humans who are not competent to make decisions (for example children and severely mentally retarded people), do not have the responsibility for decisions they make.