how do i reset my apple id security answers if the option to send them to my rescue email address is not available?

You need to ask Apple to reset your security questions; this can be done by phoning AppleCare and asking for the Account Security team, or clicking here and picking a method, or if your country isn't listed in either article, filling out and submitting this form.

They wouldn't be security questions if they could be bypassed without Apple verifying your identity.