When someone clicks your ad, the actual amount you’re charged will be:
- The minimum needed to hold your ad position or 50% of your maximum cost-per-click (max. CPC) bid, whichever is greater
- The minimum needed to hold your ad position, under the maximum cost-per-click (max. CPC) limit
- The minimum needed to hold your ad position but never less than 50% of your maximum cost-per-click (max. CPC) bid, whichever is greater
- The minimum needed to hold your ad position but never more than 120% of your maximum cost-per-click (max. CPC) bid, whichever is greater
The correct answer for the above question is:
Here you can read the explanation about the Max CPC: https://support.google.com/google-ads/answer/6297?hl=en