Linking your Google+ Page to your AdWords account…
- A) Cannot be done if you have a Google Merchant account.
- B) Requires a 2-month approval process.
- C) Enables users to login to your website through your Search advertisements.
- D) Enables you to show more endorsements for your business from your customers and supporters.
Explanation: AdWords ads that appear on Google and some search partners are eligible to show social extensions when our system can link them to an active and verified Google+ page. We’ll show the number of Google+ followers and +1s when it looks like they could improve campaign performance.
You can read more here: https://support.google.com/adwords/answer/1722132?hl=en