You own a pizzeria in downtown Chicago. With call extensions, a customer who searches for pizza on her mobile phone can see your ad along with your phone number and make the call with one click. How is that priced?

  • Click-to-call ads are flat-fee based on the caller’s phone model.
  • Click-to-call ads are priced by the minute based on the call’s duration.
  • The cost is the same as a standard click on the ad.
  • Prices are negotiated in advance with discounts for bulk purchases.

The Correct answer is:

  • The cost is the same as a standard click on the ad.

Explanation: Cost the same as a headline click (a standard CPC)

You can read more here: https://support.google.com/partners/answer/2453991?hl=en