How can I limit the number of times an option can be selected on a form?

Can you please tell us more details in regards to your question?

I can only presume that you are looking to have the form filled out for a limited amount of time and if that time runs out the form can no longer be submitted - or something similar to the same?

If I have a form that has the option of choosing A or B. Can I limit the number of time "A" is chosen overall? Say I only want "A' to be able to be chosen a max of 50 times. The result would be that the person answering the jot form would not be able to click on A if they were the 51st person or it would have a message saying "class full" or something like that.  

Thank you for the additional details. I understand what you mean and yes, it is possible to do.

The way to do it however is through a widget.

There are few widgets that have this, but based on what you have mentioned I am under the impression that one person can select the same option only once - for one submission - and that there is no need for quantity, in which case the following widgets would work best: Appointment Slots and Ticket Purchases - Form Widgets

You can add them to your form by following the steps here: How to Add a Widget to your Form