One factor the AdWords system uses to calculate an ads actual cost-per-click (CPC) is the:

One factor the AdWords system uses to calculate an ads actual cost-per-click (CPC) is the:

  A)  actual cost-per-click (CPC) of the ad showing one position lower on the page
  B)  location targeting of the ad showing one position lower on the page
  C)  cost-per-thousand impressions (CPM) of the ad showing one position lower on the page
  D)  Ad Rank of the ad showing one position lower on the page