How do you limit registrant to only one price adjustment for payment

I have a base price then a Price Adjustment to allow a discount for ladies and a different discount for minors. The registration form allows the registrant to select more than one Price Adjustment to bypass payment. Is there a way to make this field a ‘Single Selection Field’ to avoid a bypass for payment?

The price adjustment part of the payment area allows multiple choices.
Yes it is possible for people to stack their adjustments in a bad way. As opposed to choosing the correct options.
It is the Match Admins position to oversee registrations. It is no different than a 40 year old choosing a junior price. The Admin will need to correct them.