In order to appeal to customer on mobile devices, its important to:

In order to appeal to customer on mobile devices, its important to:

  • Include your phone number as your display URL
  • Avoid using ad extensions
  • Send users to a video-based landing page
  • Send users to a mobile friendly landing page

Answer : Send users to a mobile friendly landing page

Source: https://support.google.com/adwords/answer/6167155?hl=en