Which of the following items is not a component of Quality Score?
Landing page experience
Maximum cost-per-click (max. CPC) bid
Expected clickthrough rate (CTR)
Quality Score is an estimate of the quality of your ads, keywords, and landing pages. Higher quality ads can lead to lower prices and better ad positions. You can see your Quality Score (Quality Score is reported on a 1-10 scale and its components (expected clickthrough rate, ad relevance, and landing page experience) in your keywords’ “Status” column. The more relevant your ads and landing pages are to the user, the more likely it is that you’ll see higher Quality Scores. Quality Score is an aggregated estimate of your overall performance in ad auctions, and is not used at auction time to determine Ad Rank.
Read more here: https://support.google.com/adwords/answer/2454010?hl=en