If an advertiser has the same keyword in two different ad groups, the one to win a given auction will be the keyword with the:

If an advertiser has the same keyword in two different ad groups, the one to win a given auction will be the keyword with the:

  A)  highest maximum cost-per-click (CPC) bid
  B)  most historical data in the account
  C)  best Quality Score
  D)  highest Ad Rank