why dont i get the option to resert my questions using my alternate email ?

Without explaining what happens when you try, nobody hear can possibly know why you are not getting the option to reset the questions. You could try explaining in detail. Or you could try contacting Apple like the support article states.

If you couldn't send a reset email, don't have a rescue email address, or can't access email at your rescue email address, contact Apple Support. Apple may ask you to generate a temporary support PIN to verify your identity. After you reset your security questions, you might want to update your rescue email address.