Your average bid is £10 and you’ve enabled enhanced cost-per-click bidding (ECPC). Assuming you haven’t set any bid adjustments, ECPC can raise your bid to which amount when AdWords sees an auction that’s more likely to lead to a sale?
The correct answer is:
Explanation: Enhanced cost-per-click (ECPC) is a bidding feature that raises your bid for clicks that seem more likely to lead to a sale or conversion on your website. That helps you get more value from your ad budget. ECPC does a similar job for your AdWords ads. It’s a bidding feature that looks for ad auctions that are more likely to lead to sales for you and then raises your max CPC bid up to 30% (after applying any bid adjustments you’ve set) to compete harder for those clicks. ECPC factors in real-time details such as device, browser, location, and time of day to adjust your bids during each ad auction.
Read more here: https://support.google.com/adwords/answer/2464964?hl=en