Access user's selected option from option list inside event

I have option list Account Type: Student | Teacher

When user signs up the registration form, I want to send user entered details to external API via Api connector.

Currently I can access user first name ,last name and email but I can’t access selected option from data options.

Why can’t you? What do you mean?

Here I explained my problem.
I really appreciate If you can figure out.

Create a Custom State somewhere, of the Type ‘Account Type’

Then when the User clicks on either Student or Teacher, set that Custom State value accordingly.

Then when submitting your API call, use that custom state value.