One factor the Google Ads system uses to calculate an ad’s actual cost-per-click (CPC) is the:
- location targeting of the ad showing one position lower on the page.
- cost-per-thousand impressions (CPM) of the ad showing one position lower on the page.
- Maximum CPC bid of the ad showing one position lower on the page.
- Ad Rank of the ad showing one position lower on the page.
The correct answer for the above question is:
Here you can read the explanation about the Actual CPC (C0st Per Click): https://support.google.com/google-ads/answer/6297?hl=en