If you want choice field options to accept a limited number of selections, you can enable this feature from the Form Editor. Once an option is unavailable, it will be grayed out on the form.
If the limit for a choice has been reached, that option is automatically grayed out and cannot be selected anymore by the form users. To make the choice grayed out from the beginning simply type -1 as the Total value.
You have the option to Reset every day. Don’t worry, your previous submissions won’t be deleted. They will still be found in Submissions.
Select Show no. of choices left option. The form users will see the remaining available options for each choice.