Listing items from nested drop down menu

I am trying to lift all the make and model variations from the dropdown list on this page. I can achieve the element click but it doesn't seem to be saving the items themselves. I have tried all sorts of options but I can't seem to get it to work. Any help would be appreciated.

Url: Used cars for sale – find great deals with CarGurus - CarGurus.co.uk

Sitemap:
{"_id":"cg_used","startUrl":["https://www.cargurus.co.uk/Cars/forsale"],"selectors":[{"id":"make","parentSelectors":["_root"],"type":"SelectorElementClick","clickElementSelector":"select#Select\ make option","clickElementUniquenessType":"uniqueText","clickType":"clickOnce","delay":2000,"discardInitialElements":"do-not-discard","multiple":true,"selector":"select#Select\ make option"},{"id":"make name","parentSelectors":["_root"],"type":"SelectorText","selector":"select#Select\ make.selectInput","multiple":false,"regex":""},{"id":"model","parentSelectors":["_root"],"type":"SelectorText","selector":"select#Select\ model option","multiple":true,"regex":""}]}

@zzhadi Hello, it does not appear as if the website would have any indicators for the selected elements which more or less could be perceived as a technical 'defect' with the website itself.

The only feasible way to collect this data would require clicking the car make options manually and simply copying the data preview data.

Example:

{"_id":"cg_used","startUrl":["https://www.cargurus.co.uk/Cars/forsale"],"selectors":[{"extractAttribute":"","id":"model","parentSelectors":["_root"],"selector":"select[id=\"Select model\"] optgroup option","type":"SelectorGroup"}]}

@ViestursWS Thank you so much for confirming what I feared, I'll stop wasting time trying to solve this now! Could this possibly be an intentional 'defect' to stop the lists from being scraped?

Thanks again for your help!