Ads Often Show on Google with a Fifth Line of Ad

Ads often show on Google with a fifth line of ad text, which includes the city or region targeted by a campaign. One reason this occurs is because:

A) One of the keywords in the campaign is the name of that country.
B) The language preferences of the user assume a location.
C) The Internet Protocol (IP) address of the user is located in the city targeted by the campaign.
D) The search query included the name of the city.