Target CPA bidding can help drive conversions by using your conversion history and:
OR
Target cost-per-acquisition (CPA) bidding can help drive conversions by using your conversion history and:

  • cost-per-acquisition (CPA) goals to show the optimal ad when a conversion is more likely
  • cost-per-click (CPC) goals to show the optimal ad when a conversion is more likely
  • cost-per-acquisition (CPA) goals to raise your bid when a conversion is more likely
  • cost-per-click (CPC) goals to raise your bid when a conversion is more likely

The correct answer is:

  • cost-per-acquisition (CPA) goals to raise your bid when a conversion is more likely

Explanation: Target CPA is an AdWords Smart Bidding strategy that sets bids to help get as many conversions as possible at the target cost-per-acquisition (CPA) you set. It uses advanced machine learning to automatically optimize bids and offers auction-time bidding capabilities that tailor bids for each and every auction.

Read more here: https://support.google.com/adwords/answer/2390684?hl=en