If you want to prioritize downloads of your mobile app instead of visits to your mobile site, you should:

  • add a call extension
  • add a sitelink extension
  • create a Universal App campaign
  • include the word “install” in the ad text

The correct answer is:

  • create a Universal App campaign

Explanation: As an app advertiser, you want to get your app into the hands of more paying users. So, how do you connect with those people? Universal App campaigns streamline the process for you, making it easy to promote your apps across Google’s largest properties including Search, Google Play, YouTube, and the Google Display Network.

Read more here: https://support.google.com/adwords/answer/6247380